1 . The green and red watermelon is a sweet, refreshing summer snack. But it wasn’t always so sugary or brightly colored. So what did watermelons originally taste and look like, and from where did they come?
The fruit isn’t from the Fertile Crescent of ancient Mesopotamia, as so many other domesticated (家养的) crops are, research shows. Susanne Renner, a scientist, and her colleagues carried out comprehensive genetic sequencing (基因测序) of the domesticated watermelons — the kind you might find on supermarket shelves — along with six wild watermelon species.
“We found the modern genomes (基因组) of the domesticated watermelon are more closely related to the Sudanese wild type than any other that we analyzed,” she said. The Sudanese wild watermelon has some obvious differences from the domesticated version. “The flesh is white and not very sweet, and it’s mainly used as animal feed,” Renner said. Nevertheless, the genetic similarity between the two species led the researchers to conclude that the Sudanese fruit is probably a precursor (前身) to the red and sweet domesticated watermelon.
It’s likely that ancient farmers grew non-bitter varieties of the wild watermelon and thus increased its sweetness over many generations through the domestication process. The red color is probably also thanks to artificial selection, in which farmers likely favored and selectively bred red fruit.
We already knew that the ancient Egyptian king Tutankhamun was buried with watermelon seeds 3,300 years ago, yet that isn’t sufficient proof of a domesticated, sweet watermelon. But then, Renner found an image of a watermelon-like fruit on an ancient Egyptian tomb painting, thought to be more than 4,300 years old. In a separate tomb, another image showed the watermelon cut up in a dish alongside other sweet fruits. This realization, coupled with Renner’s genetic findings, suggests that the watermelon was most likely domesticated around that time either in Egypt or within trading distance of the ancient empire.
“Historically speaking, that’s a very significant finding,” said Hanno Schaefer, a professor of plant biodiversity. “It’s becoming clearer that we’ve greatly neglected the North African region. We’ve focused too much on the Fertile Crescent and we need to invest more resources into studying the agriculture of North Africa.”
1. What can we learn about the Sudanese wild watermelon?| A．It is brightly colored and sugary. |
| B．It is consumed mainly by animals. |
| C．It has no connection with the domesticated type. |
| D．It has more differences than similarities to the domesticated type. |
| A．More resources will be devoted to agriculture research in South Africa. |
| B．The domesticated watermelon has a history of at least four thousand years. |
| C．The domesticated watermelon probably developed from the Sudanese type. |
| D．Few domesticated crops are from the Fertile Crescent of ancient Mesopotamia. |
| A．The history of the Sudanese wild watermelon. |
| B．Where wild watermelons actually come from. |
| C．The characteristics of domesticated watermelons. |
| D．How domesticated watermelons came into being. |
| A．Favorable. | B．Doubtful. | C．Critical. | D．Tolerant. |
2 . A lot of health care are connected with being around trees.
They also do a great deal of good for the environment by reducing air pollution and taking in carbon dioxide from the atmosphere.
A tree’s ability to take in carbon dioxide is especially useful when the tree.is in cities or towns, where there are too many industrial activities. For the study, the researchers used laser scanning methods to take their own carbon readings of trees from the ground as well as the air.
They determined that Camden had a median carton density (浓度) of around 55 tons of carbon per hectare (t/ha). Greener areas of the borough, like Highgate Cemetery, had a carbon density of 380 t/ha — levels that are typically seen in rainforests.
So what exactly does this mean? Trees could help cool the atmosphere by removing carbon dioxide from the air. However, some climate scientists argue that it’s more complicated (复杂的) than that.
| A．We need to protect the ones we already have. |
| B．Global warming is happening at a faster rate than ever. |
| C．These benefits aren’t just felt in the countryside, either. |
| D．For comparison, major cities in the US have a carbon density of 7.7. |
| E．They have been known to reduce people’s stress and improve overall mental health. |
| F．Then they compared their findings with the data from the UK Environment Agency. |
| G．They think the impact of tree-planting activities today may not be seen for many years. |
3 . You’ll only find cherry blossoms in a handful of countries.
Called sakura in Japan, the cherry blossoms of Yoshino and Kyoto are world-famous. Tourists flock to the country each spring to try their hand at a centuries-old activity “flower viewing”. You don’t have to fly to Japan to see them, though. In the US, the cherry blossoms of Washington, D.C., New York City, Philadelphia, St. Louis, Seattle, San Francisco, and Boston are all beautiful in their own way. The flowers can also be viewed in many European and Asian countries, as well as Brazil and Australia in the southern hemisphere.
There are hundreds of cherry tree varieties.
Japan in particular is home to hundreds of types of cherry trees -possibly more than 600.Some types bear fruit, while others don’t. The flowers of many trees change from dark pink to light pink to white throughout the different stages of blossoming, while others progress from greenish yellow to white to pink. One variety, called Kanzan, was bred to have “double blossoms” — or up to28 petals (花瓣) on each flower, compared to the Yoshino tree’s five petals.
You can get arrested for picking a cherry blossom in Washington, D. C.
Resist the urge to take a cherry blossom home with you as a souvenir. In D.C. at least, breaking off a blossom or branch is viewed as destruction of federal property. Those who break this rule could receive a citation (传票), or worse, be arrested. It goes without saying that it’s also illegal to climb the trees. If they sustain damage to their branches, they will never be able to grow new blossom on that particular branch again.
Both the blossoms and leaves are edible.
In Japan, no part of the cherry blossom tree pes to waste. The preserved leaves are used as edible mochi wrappers (a rice cake filled with sweet bean paste), and a number of seasonal snacks feature sakura as a key ingredient Sakura-flavored versions of Pepsi, Coke, tea, and even Starbucks lattes are all popular drinks. You can also find Kit Kats and Pocky snack sticks that taste like sakura.
They were the inspiration behind a record-setting LEGO sculpture.
Legoland Japan, a theme park in Nagoya, set a Guinness World Record in 2018 for the largest LEGO brick cherry blossom tree ever made. The trees stood 14 feet tall, weighed over 7000 pounds, and consisted of more than 800,000 LEGO bricks.
1. In which country can’t you see cherry blossoms according to the passage?| A．America. | B．China. | C．Germany. | D．Egypt |
| A．Climbing cherry trees is tolerable in Washington. | B．Sakura-flavored snacks and drinks are welcomed. |
| C．Kanzan sakura is better than Yoshino sakura. | D．The largest cherry blossom tree grows in Japan. |
| A．A passionate environmentalist. | B．An ecological researcher. |
| C．A student interested in plants. | D．A tourist in Japan |
4 . Plants and exposure to greenery have been found to have multiple mental health benefits, such as lowering stress, decreasing feelings of depression, increasing sociability, restoring focus, improving cognitive performance, improving mood, and increasing self-esteem.
Gardening and care for plants can help to turn people away from negative thoughts or emotions. So with all that, what do these experts recommend as the best plant?
Snake plant. It’s very easy to care for, thrives in spaces with low sunlight, has visual appeal, and cleans the air, and they are drought resistant if you forget to water them.
Spider plants. Spider plants, with plenty of light-green leaves, are another low-maintenance selection.When a spider plant thrives, it will grow new offshoots that can be clipped and potted as a new plant.
Aloe Vera. Drought-resistant and easy to grow. Aloe Vera is low-maintenance, you can just water it monthly, and it helps clean the airspace and is helpful for burns, cuts, and scrapes to help injuries heal faster or soothe pain.
Lavender is well-known for its relaxing scent, and it has a calming effect, aids in reducing stress, promotes sleep.This means it’s great both in the garden, or clipped and dried in a bowl inside your space .
Basil is a summertime herb that loves the sun. Not only is it delicious in meals, but eating basil has health benefits, too. It has properties which help to relieve stress and anxiety.
Lemon balm. This fragrant green herb is part of the mint family and is simple to cultivate. Known for its calming properties, it has a light lemony scent that can be wonderfully intensified by rubbing the leaves between your fingers. It has been used to improve sleep, reduce stress and anxiety, improve appetite, and help with indigestion.
1. What can we know from the passage?| A．Spider plants will still survive if you forget to water them. |
| B．Lavender is recognized for its mint scent and calming effects. |
| C．Snake plants grow well in spaces without enough sunlight. |
| D．Basil is not edible but has some valuable properties. |
| A．They need little water. | B．They appeal to the eye. |
| C．They help us calm down. | D．They enhance health. |
| A．Two | B．Three | C．Four | D．Five |
5 . With no special equipment, no fences and no watering, two abandoned agricultural fields in the UK have been rewilded (重新野化), in large part due to the efforts of jays, which actually “engineered” these new woodlands. Researchers now hope that rewilding projects can take a more natural and hands-off approach and that jays can shed some of their bad reputations.
The two fields, which researchers have called the New Wilderness and the Old Wilderness, had been abandoned in 1996 and 1961 respectively. The former was a bare field, while the latter was grassland—both lay next to ancient woodlands. Researchers had suspected that the fields would gradually return to wilderness, but it was impressive to see just how quickly this happened, and how much of it was owed to birds.
Using aerial data, the researchers monitored the two sites. After just 24 years, the New Wilderness had grown into a young, healthy wood with 132 live trees per hectare, over half of which (57%) were oaks. Meanwhile, the Old Wilderness resembled a mature woodland after 39 years, with 390 trees per hectare.
“This native woodland restoration was approaching the structure (but not the species composition) of long-established woodlands within six decades,” the researchers explained in the study.
Part of this reforestation was done by the wind, and researchers suspect that previous ground disturbance may have aided the woodland establishment—which is good news, as it would suggest that agricultural areas may be reforested faster than anticipated. However, animals—Eurasian jays, thrushes, wood mice, and squirrels—also played an important role in helping the forests take shape. This handful of species provided much of the natural regeneration needed for the forest to develop. Jays, in particular, seem to have done a lot of heavy lifting.
1. What does the underlined word “shed” in Paragraph 1 refer to?| A．Be opposed to. |
| B．Be ashamed of. |
| C．Get used to. |
| D．Get rid of. |
| A．The scale of the woodlands. |
| B．The diversity of the fields. |
| C．The rate of the changes. |
| D．The frequency of the wilderness. |
| A．The woodland restoration was approaching the structure of long-established ones. |
| B．Much of the wilderness of the fields was owed to birds. |
| C．Previous ground disturbance aided the woodland establishment. |
| D．How quickly the fields returned to wilderness over time. |
| A．The essential role of humans in the reforestation. |
| B．The factors that contribute to the reforestation. |
| C．The importance of woodland establishment. |
| D．The threats faced by a handful of wild animals. |
6 . Healthy House Plants: A Complete Gulde to Gardening Indoors
BBC Gardeners’ World Magazine has collaborated (合作) with digital educational platform, FutureLearn, to bring you a brand new online gardening course — Healthy House Plants: A Complete Guide to Gardening Indoors. This four-week online course has been designed to provide you with tips and advice on growing indoor plants and take you on a world journey, exploring imported plants.
Your course instructor
The course is led by expert tutor and Associate Editor, David Hurrion, who will share his 50 years of gardening experience and bring his skills to you online, so you can learn from him in the comfort of your own home.
Learning on this course
You can take this self-guided course. On every step of the course you can meet other learners, share your ideas and join in with active discussions in the comments.
What’s covered in this course?
Week 1: What will you grow?
Week 2: Growing conditions and the indoor environment.
Week 3: Caring for your house plants.
Week 4: Making more plants and problem-solving.
Course registration (注册) and cost
There are three options for registering for this course：
*FREE — Access to the course is limited to six weeks, and no certificate (证书) is given.
*Upgrade for £32, unlimited time access, and a printed and digital certificate.
*Unlimited access to all FutureLearn short courses: £16.68/month.
More online courses with FutureLearn
Gardening for Beginners: The Basics and Beyond: Grow your gardening skills with easy-to-follow techniques aimed at both new and experienced home gardeners in this five-week online course.
1. What can the learners of this four-week course do?| A．Learn at their own pace. | B．Receive personalized guidance. |
| C．Attend more online courses for free. | D．Hand in a composition online. |
| A．Week 1. | B．Week 2. | C．Week 3. | D．Week 4. |
| A．£16.68. | B．£32. | C．£33.36. | D．£48.68. |
7 . Imagine a plate holding two strawberries, similar in appearance. One came out of a supermarket box, meaning it was probably harvested before it is fully grown, immediately placed in a forced-air cooling unit, loaded onto a refrigerated truck and driven hundreds of miles. By the time it reached the plate two weeks may have passed. The other strawberry was picked from a garden minutes before being eaten.
The first one will probably not taste good as expected. The second is likely to be sweet; the flavor will remain in the mouth. Supermarket strawberries are not entirely without advantages: they are convenient and available even in winter. But the two berries differ from each other in the same way that hearing music in a concert hall differs from listening to an MP3. The home-grown fruit is an eatable case for planting a home garden.
Planting cool-weather greens can seem meaningless as well-stocked supermarket shelves are available all week. But the same could be said of cooking: cheap and good restaurants everywhere, so why bother to make your own meals?
That attitude fails to understand the basic appeal of gardening: it mistakes the product for the purpose. It is true that a garden can produce tomatoes and carrots that taste like themselves rather than the plastic they are usually packaged in. Finding some favorite vegetables in the shops can take some time, effort and expense; growing your own vegetables, rare or routine, ensures a reliable supply.
On the other hand, a garden, especially in the early years, can also produce frustration. Creative gardeners may plant the wrong crops for their soil. Little animals may have the habit of taking single bites of cucumbers, beans and tomatoes. And even expert gardeners can lose a season’s harvest to uncooperative weather.
No matter. The real joy of gardening is the time spent doing it. The deepest pleasure- -as with cooking, writing, bringing up children or almost anything worthwhile- -is in the work itself. A gardener’s memories center not around the food produced, but around long summer afternoons with hands in the dirt of a home garden, surrounded by family. To garden is to patiently and lovingly help life grow, in the ground and above it.
1. What might have caused the strawberries to taste different in paragraph 1?| A．Temperature. | B．Freshness. | C．Appearance. | D．Soil. |
| A．To promote supermarket strawberries. |
| B．To highlight the value of a home garden. |
| C．To stress the differences between them. |
| D．To provide suggestions on fruit shopping. |
| A．Regarding planting a garden as worthless. |
| B．Favoring what is grown in a home garden. |
| C．Enjoying food made by yourself at home. |
| D．Understanding what a garden is intended for. |
| A．Stores can never take the place of a garden. |
| B．Garden products are not for sale in the stores. |
| C．Gardens may fail to produce what you want. |
| D．Training is required for productive gardens. |
| A．Observe patiently how plants grow all summer. |
| B．Spend time taking care of a garden with family. |
| C．Make friends with gardeners in the neighborhood. |
| D．Labor lovingly to clean the dirt out of the garden. |
8 . A Europe-wide study has found that the drying out of soils across the continent as the planet heats up is leading to the deaths of more and more trees. “European forests are suffering,” says Jan-Peter George at Tartu Observatory in Estonia. “It needs to be made clear to everyone in Europe, whether you are in the north or the south, that this will become a huge problem.”
There is already growing data showing that the lack of underground water due to climate change is killing off more trees in Europe. But most previous studies have focused on particular areas or been based on satellite (卫星) surveys, where it is hard to know whether a tree has died or been cut down.
George and his team have instead studied about 3 million on-the-ground observations made as part of a program called ICP Forests, which was set up in the 1980s. Using this data set meant the team can manage not to include tree deaths due to being cut down.
The researchers found that annual mortality rates (死亡率) are rising for all tree species. Norway spruce (挪威云杉) has been hardest hit, with mortality rates 60 percent higher on average between 2010 and 2020 than between 1995 and 2009. For Scots pine, rates are up 40 percent, European beech 36 percent, and oak 3.5 percent. What’s more, for all species and regions, annual mortality rates have been positive since 2012. A positive annual mortality rate means that more trees are dying than usual, compared with the long-term average. “This could mean that European forests reached an extremely important point in 2012,” says George.
A lack of water due to global warming is far from the only threat (威胁) to Europe’s trees. Diseases have been damaging most trees in Europe. Wood harvesting has also increased by 50 percent since 2016.
1. What does the underlined part “a huge problem” in paragraph 1 refer to?| A．Soil drying in Europe. | B．Europe’s trees dying. |
| C．Europe’s rising temperature. | D．Widening regional differences in Europe. |
| A．It focuses on selected areas. | B．It examines more exact data. |
| C．It carries out more satellite surveys. | D．It has done follow-up studies for 40 years. |
| A．All tree species have been dying more than usual. |
| B．European beech populations have hardly changed. |
| C．Many more oaks have been planted in some regions. |
| D．Scots pine has been in more danger than Norway spruce. |
| A．Influences of global warming. | B．Increases in wood harvesting. |
| C．Treatments for forest diseases. | D．Possible causes of tree death. |
9 . Flower scents (香味) help pollinators (传粉者) locate their favorite plants. Scientists have established that air pollutants change those scents, throwing off the tracking abilities of such beneficial insects as honeybees. But new lab experiments are the first to confirm that one pollinator, the tobacco hawkmoth, can quickly learn that a pollution-changed scent comes from the jasmine tobacco flower that the insect likes.
Chemical ecologist Markus Knaden and colleagues focused on one pollutant-ozone, the main element in smog. In the lab, his team blew an ozone-changed scent from a tiny tube into a tunnel, with a moth (飞蛾) awaiting at the far end of the tunnel. Usually, when the moth smells the unchanged scent, it flies upwind and uses its long, skinny mouthparts to probe the tube the way that it would a flower. The researchers expected that the changed scent might throw the moth off a little. But the insect wasn’t attracted at all.
In addition to scent, tobacco hawkmoths track flowers visually, so Knaden’s team used the feature, along with a sweet snack, to train the moth to be attracted to a pollution-changed scent. The researchers wrapped a brightly-colored artificial flower around the tube to trick the moth back across the tunnel, despite the unfamiliar scent. And the team added sugar water to the artificial flower. After a moth was given four minutes to taste the sweet stuff, it was attracted to the new smell when sent into the tunnel 15 minutes later, even when neither the sugar water nor the visual signal of the artificial flower was present.
This study focused on only one moth species, but Knaden’s team is now working on planning experiments with other pollinators that are easier to follow than tobacco hawknoths. While he guesses honeybees might also be as adaptable as the moth was, that won’t be true of every pollinator. “The situation can become very bad for insects that are not as clever or cannot see that well. I don’t want the take-home message to be that pollution is not a problem.”
1. What does the underlined word “probe” in paragraph 2 mean?| A．Surround. | B．Favour. | C．Access. | D．Examine. |
| A．not all moths were attracted to ozone-changed scent as expected |
| B．the current research conducted by Knaden is pioneering and wide-ranging |
| C．not all pollinators are adaptable to human-driven changes to their environment |
| D．the moth didn’t like the new smell without sugar water and artificial flower |
| A．Positive. | B．Cautious. | C．Unclear. | D．Critical. |
| A．A moth can be rid of the tracking ability to locate its favourite plants. |
| B．A moth is able to establish a relationship between pollution and scents. |
| C．A moth may outsmart smog by learning to like pollution-changed scent. |
| D．A moth is born with an ability to adapt to the changes in the environment. |
10 . If there is one thing that comes to mind when the words “South Pacific” are spoken, then it must be coconut palms (椰子树). Most of us have images of all attractive coconut palms lining sandy beaches. But the coconut tree is more than a central characteristic of picture postcards bought by tourists.
To people of the South Pacific, the coconut tree is also known as the “Tree of Life”. It gets this name because of the different kinds of products which the coconut palm provides from its various parts. From the leaves down to its roots, it plays a great part in the life of many island people. The coconut tree provides food, shelter, fuel as well as income from exports.
Coconut leaves produce good-quality paper pulp (纸浆), hats, wastebaskets and bags. Flesh (果肉) and water (often called the milk) from the young, green coconut can be taken as a healthy food and drink. It is also used in salads and other tasty dishes.
Coconut husks (外壳) it are often thrown away, but they can be used to produce different kinds of useful products such as ropes, fishing nets, and floor coverings.
Coconut water can be used in the production of wine and is also used to treat a number of medical problems.
The white coconut flesh is a good source of coconut oil, coconut chips, and feed for animals.
The trunk of the coconut tree is a strong and durable wood, which can be used to build houses.
Medicines and dyes (燃料) are obtained from the roots.
The English oak, the Lebanon cedar or the Australian gum tree all have a place in history but the coconut palm is the only true “Tree of Life”.
1. Why is the coconut palm called the “Tree of Life”?| A．It has a long lifetime. | B．It is mostly exported. |
| C．It has a vast range of uses. | D．It is necessary for islanders. |
| A．Leaves. | B．Flesh. | C．Husks. | D．Water. |
| A．long-lived. | B．wet. | C．flexible. | D．rough. |
| A．To introduce a useful type of plant. |
| B．To announce some new discoveries. |
| C．To tell readers about island people’s life. |
| D．To explain how to make full use of coconut leaves. |
