1 . A forest in Staffordshire (in the UK) transformed into a hi-tech laboratory. Researchers here are investigating how the trees use carbon, and it’s difficult to find out. In an unusual experiment, extra carbon dioxide is piped to the trees, to create the kind of atmospheric conditions expected in the middle of the century. And instruments measure how the forest reacts.       

The scientist in charge says there’s still a lot to learn. And he worries that governments and companies are rushing to plant trees as an easy answer to climate change. “If you try and use trees to tidy up the mess that we’re making through emissions, you are putting those trees into a very rapidly changing climate and they will struggle to adapt,” said Professor Rob MacKenzie, University of Birmingham.

This device tracks the movement of carbon dioxide. In a healthy forest, the gas is not only absorbed by the trees but some is released as well. What scientists here are finding out is the way carbon flows into a forest and out of it is a lot more complicated than you might think. So, if mass tree planting is meant to be a solution to tackling climate change, the trees are going to have to be monitored and cared for, over not just decades, but may be centuries as well.

Of all the challenges, the task of planting is the simplest. Shelby Barber from Canada can do an amazing 4,000 trees in a day. “People talking about planting millions billions of trees around the world. Is it possible do you think, physically?” asked BBC.

“It’s definitely possible with the right amount of people, the right group of people. I’ve personally, in three years, planted just over half a million trees.” said Professor Rob MacKenzie.

Once planted, the trees need to survive, and experts are mixing different types to minimize the risk of disease. “It’s a bit like making sure you don’t put all your eggs in one basket, you’re spreading out your risk. And then if one part of that woodland fails, for whatever reason, it gets a disease or it can’t tolerate future climatic conditions, there are other parts of the forest that are healthy and able to fill in those gaps.” said Eleanor Tew of Forestry England.

Suddenly there’s momentum to plant trees on a scale never seen before. So what matters is doing it in a way that ensures the forests thrive — so they really do help with climate change.

1. Why is extra carbon dioxide piped to the trees in the experiment?

A．To predict the future atmospheric conditions.

B．To imitate the possible air condition in the future.

C．To create an instrument to measure atmospheric conditions.

D．To investigate the quality of air condition in the future.

2. The underlined word “some” in the second paragraph refers to __________.

A．oxygen

B．carbon dioxide

C．mess

D．purified gas

3. What will Eleanor Tew suggest concerning the survival of the forest?

A．Minimizing the area of the woodland.

B．Studying future climatic conditions.

C．Planting different types of trees.

D．Avoiding mixing different species.

4. Which statement concerning mass tree planting will Professor Rob Mackenzie mostly likely agree with?

A．It should be advocated in terms of efficiency and convenience.

B．It is the most effective solution to fighting climate changes.

C．It will do more harm than good to the health of the environment.

D．It needs to be studied further as a measure against climate change.

2 . Keeping a bit of the outdoors inside is nothing new, but houseplant collections have become a popular social media trend — which means that more people than ever are discovering the comfort and beauty that caring for plants brings.

    1     Exposure to greenery, whether you have indoor plants, take walks outside or tend to a garden, has 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.

“One study showed that patients at a hospital who had plants in their room reported less pain, lower blood pressure, less fatigue and less anxiety than patients without plants in their rooms,” says Jenny Seham, a New York-based psychologist. She explains: “Cortisol, the stress hormone, has been shown to lower with plant interaction, reducing fatigue, irritability (易怒) and blood pressure.”

Research has also shown that having plants and gardening increase productivity and levels of serotonin, the neurotransmitter responsible for lifting our mood.     2     And it is also opposed to dwelling on the past or worrying about the future.

Before you fill your space with greenery, consider how you’ll interact with your plants.     3     Can you care for them daily?

If you have a small space or aren’t sure how much time you’re willing to invest in “plant parenting.” Start slow. “    4     It can engage you by its smell or colour, creating a positive mood response with every interaction,” says Seham.

A．For instance, is there enough space for plants in areas where you spend a lot of time?

B．Half the fun of gardening is that you never know exactly what’s going to come up.

C．It’s a feel-good hobby that’s supported by science.

D．While indoor gardening can boost your feelings of wellbeing, help reduce stress and promote relaxation, it’s not, of course, a substitute for a trained mental health professional.

E．The theory is that plant care helps us focus on the present moment and provides a feeling of accomplishment.

F．Just one plant can make a difference.

3 .

A．Bring flowers.	B．Take a pot plant.
C．Buy postcards.	D．Send fruits.

4 . How to Care for Your Tree

1. Water the newly planted tree. Once the tree is planted, water it and keep up a _________ schedule of watering.

Water the tree every day for several weeks to let the _________ get established in the surrounding soil. After this you can reduce the frequency of watering.

Water as necessary for the conditions in your area. _________ humidity into consideration to help you decide _________ to water your tree.

If you are planting fruit or nut trees for a small home orchard, continue to water weekly for the _________of the tree, as your crop depends on consistent irrigation. You’ll also want to fertilize fruit and nut trees monthly, or _________ package directions.

2. Use mulch (覆盖物). Considering adding a layer of mulch _________ your tree to help keep moisture in and weeds out.

Cover the planting hole with 1-3 inches of shredded hardwood or leaf mulch. Keep the mulch at least 12 inches away from the trunk _________ it may cause the trunk to rot.

Mulching around the tree will _________ the tree from trampling and lawnmowers, __________ are two activities that commonly kill young trees.

3. Prune the tree if necessary. If there are any broken, dead, or diseased limbs on your tree,   __________ them gently with knife. If there is nothing wrong with the tree, there is no need to prune it until after the first growing season.

4. Enjoy the tree as it grows over the years. Appreciate its __________ and beauty and thank yourself for adding another tree to the world. You won’t regret it and __________ you properly care for it, the tree can grow long time!

You’ll need to make sure that you water your plant to keep it thriving. You want to achieve __________ of giving it enough water to penetrate (穿透) the roots while not drowning it.

Watering your tree with a steady stream from a garden hose for about 30 seconds should be sufficient. The soil should feel moist at all times and mulch will help retain the moisture.

Check soil moisture by digging about 2 inches below the surface and then use your __________ to test if the soil is moist. If it is, you don’t need to water.

1.

A．native

B．particular

C．regular

D．positive

2.

A．twigs

B．barks

C．trunk

D．roots

3.

A．Give

B．Take

C．Think

D．Look

4.

A．when

B．why

C．how

D．what

5.

A．life

B．color

C．shape

D．beauty

6.

A．related to

B．due to

C．owing to

D．according to

7.

A．around

B．across

C．beside

D．along

8.

A．so

B．and

C．or

D．if

9.

A．protect

B．provide

C．plant

D．grow

10.

A．for which

B．which

C．that

D．on that

11.

A．water

B．remove

C．treat

D．handle

12.

A．color

B．landscape

C．shade

D．scene

13.

A．as long as

B．even if

C．in spite of

D．in terms of

14.

A．unity

B．fact

C．chance

D．balance

15.

A．ruler

B．finger

C．hand

D．stick

5 . At first, the grains of rice that Ingo Potrykus held in his fingers did not seem at all _________, but inside, these grains were not white, as ordinary rice is, but a very pale yellow — thanks to beta-carotene (胡萝卜素), a building block for vitamin A.

For more than a decade Potrykus had _________ creating a golden rice that could improve the lives of millions of the poorest people in the world, strengthening their eyesight and their _________ disease.

_________ imagining golden rice was one thing and creating one quite another. Year after year, Potrykus and his colleagues ran into one _________ after another until success finally came in the spring of 1999.

At that point, he tackled an even greater challenge. The golden grains _________ pieces of DNA borrowed from bacteria and flowers. It was what some would call Frankenfood, a product of genetic engineering. As such, it _________ a web of hopes and fears.

The debate began the moment genetically engineered crops (GM crops) were first sold in the 1990s, and it has _________ ever since. First to start major protests against biotechnology were European environmentalists and consumer-advocacy groups. They were soon followed by their U.S. counterparts (相对应的人事物).

The hostility is _________. Most of the GM crops __________ so far have been developed to produce a plant that is not harmed by chemicals used to kill weeds (杂草) in the fields. These genetically engineered crops are often sold by the same large, multinational corporations that __________ the weed-killing chemicals that farmers spray on their fields. Consumers have become suspicious (怀疑的).

The benefits did seem small __________ golden rice was developed. It is the first strong example of a GM crop that may __________ not just the farmers who grow it but also the consumers who eat it. In this case, those include at least a million children who die every year because they are weakened by vitamin-A deficiency (缺乏) and an additional 350,000 who go blind.

Many people __________ poverty and hunger look at golden rice and see it as evidence that GM crops can be made to serve the greater public good. They see a critical role for GM crops in feeding the world’s ever-increasing population. As former U.S. President Jimmy Carter put it, “Responsible biotechnology is not the enemy; __________ is.”

1.

A．typical

B．special

C．local

D．white

2.

A．dreamed of

B．come in handy

C．been reminded of

D．broken up

3.

A．attempt at

B．effort to

C．resistance to

D．majority of

4.

A．But

B．And

C．While

D．Since

5.

A．surprise

B．obstacle

C．norm

D．opposition

6.

A．achieved

B．stressed

C．overlooked

D．contained

7.

A．was caught in

B．was alive with

C．be conscious of

D．was honored by

8.

A．announced

B．maintained

C．escalated

D．applied

9.

A．brilliant

B．understandable

C．discharged

D．rewarding

10.

A．introduced

B．reminded

C．respected

D．overlooked

11.

A．toss and turn

B．give and take

C．produce and sell

D．demand and supply

12.

A．until

B．after

C．although

D．when

13.

A．feature

B．mark

C．build

D．benefit

14.

A．worried about

B．ashamed of

C．filled with

D．admired for

15.

A．terror

B．misery

C．starvation

D．crisis

6 . Directions: Fill in each blank with a proper word chosen from the box. Each word can be used only once. Note that there is one word more than you need.

A. adaptable        B. classic          C. determined   D. effectively   E. fundamentally F. immediately     G. sideways       H. stretched       I. survival        J. underside       K. upright

Why Are Trees Tree-shaped?

While running through a leafy park days ago, I passed dozens of tree species of different sizes and ages, and I was suddenly struck by how     1     similar they were. Wide trunks split into smaller branches in the same sort of way. You could guess the height of a tree just by looking at how wide its trunk is. We would notice     2     if someone drew a tree with branches that were too wide or a trunk that was too thin. What makes a tree look like a tree? Maximising the sunlight hitting the tree’s leaves is obviously critical for the tree’s     3    . But the size and shape of the branches is largely     4     by a different standards: a tree must be strong enough to stay standing     5    , possibly for centuries. Imagine an oak tree, with branches reaching     6     off the main trunk. Each branch has to support its own considerable weight, so the wood in its lower half is slightly compressed and the top half is being     7    . That top layer of a branch takes the weight of the branch. And a particular type of wood has grown there to do that job. It’s called reaction wood, because it formed as reinforcement (增强) to take the increasing weight as the branch grew. The trees that reinforce on top the branches are the “lollipop” ones:     8     branching species like oaks. But there is another way of solving that problem. Some trees grow their reinforcing reaction wood on the     9     instead, so the branch is pushed up, rather than pulled from above. It works, but not as     10    , so these trees can’t support large side branches. The ones that reinforce underneath have a thick trunk with much smaller side branches, and they grow to be conical—some examples of these trees are pines and firs.

oak pine fir

7 . Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.

A New Orchid was Found in Japan

Nature is full of secrets. There are still many things to find out about it. One of those things was discovered last week in Japan. It is rare to find a new plant in Japan. An amateur naturalist came across a new species of orchid     1     other flowers in Tokyo. Scientists also found the flower elsewhere in other districts, an indication that the new species     2     deserve further investigation.

The newly-found orchid is beautiful. It is pink and white, it has a central stem, around     3     grow tiny, bell-shaped flowers, and its delicate petals (花瓣) look like they are made from glass. The flower is a neighbor to a(n)     4     (relate) orchid species common in Japan.

Sometimes unknown species are often living right under our noses — in parks, gardens and even in planters on balconies. That’s     5     researchers in Japan recently recognized this new species of orchid. Professor Kenji Suetsugu from Kobe University said the discovery of new species in usual places means it is necessary to keep exploring, even in everyday places that     6     (not look) so remarkable.

There are about 28,000 orchid species worldwide. The new orchid belongs to a class called Spiranthes. There are about 50 different kinds of Spiranthes. They are     7     (familiar) kind of orchid in Japan, for they appeared in a Japanese poem dating to 759 AD. Professor Suetsugu said he and his colleagues were “delighted     8     (identify) a new species”. He said it was exciting because it wasn’t found hidden deep in a rainforest or jungle. The discovery of the new orchid is good news. However, many orchids are on the endangered species list due to habitat loss. We need to protect natural environments to stop flowers     9     (disappear). The world will be far less colourful     10     we lose more orchids.

8 . 听下面一段较长对话，回答以下小题。1.

A．To help the man learn more about the gardener.

B．To show the value of taking advice in gardening.

C．To publicize the attractiveness of Dorset Gardens.

D．To inform people of more guidelines for gardening.

2.

A．By attending a college course.	B．By visiting Kew Garden.
C．By listening to talks on gardening.	D．By reading Margery Fisher’s book.

3.

A．It was full of creative angles.	B．It made her famous in the town.
C．It occupied a rather small area.	D．It was near her house in Somerset.

4.

A．Because it’s full of plants given by her friends.

B．Because it’s visited and appreciated by tourists.

C．Because it’s where she spends much time with others.

D．Because it’s an outdoor classroom for biology students.

9 . The Bitter Truth Behind Vanilla

Vanilla is one of the world’s most popular spices and an important ingredient in products ranging from chocolate to perfume. However, the wholesale price of vanilla has reached up to $600 per kilogram, when just a few years ago it fetched a tenth of that. What is happening?

Madagascar supplies more than 80 percent of the world’s natural vanilla. In the 19th century, the French introduced Bourbon vanilla to their African island colony. Today, vanilla represents 20 percent of Madagascan exports, worth around $600 million at current prices. However, it is a difficult crop to grow. A vine takes three to four years to mature.     1     Nine months later, the green beans must be hand-picked when perfectly ripe to optimize their vanillin content (the compound that gives vanilla its flavor). Months of blanching(焯水), sweathing(焖煮) and gradual drying in the sun are then necessary to produce the aromatic(芳香的) spice. Six hundred hand-pollinated blossoms yield about six kilos of green beans, which convert to one kilo of dried beans.

The price of Madagascan vanilla was once set by the government.     2     Madagascar’s government was eventually forced to end its price-fixing regime(体制). Food giants such as Unilever and Nestlé also increased their use of synthetic vanillin, which can be produced from reliable sources, adding to the pressure. For 30 years, Madagascar’s vanilla farmers earned just a pittance, and many ended up leaving the business. But even with fewer producers, the price of natural vanilla stayed low.

It was not until public tastes started shifting towards all things natural that farmers’ fortunes revived. From around 2011, some manufacturers began focusing once more on natural vanilla. In 2015, Nestlé announced plans to use only natural ingredients in five years, and Hershey’s followed suit.     3     Extreme weather, weak crop-security, and exporters who hoard inventory(囤货) and speculate (做投机买卖) on further rises have also kept prices high.

    4     To prevent theft of their now rather valuable crops, farmers have taken to harvesting the beans early, thereby reducing the overall quality of the crop. That forces the government to make greater efforts to enforce penalties(处罚). If it manages this, Madagascar could yet savor the benefits of its near monopoly(垄断).

A．It’s expensive because it’s both labor-intensive and time-consuming to grow.

B．Demand has therefore surged, and with it prices - in part because natural supplies are insufficient.

C．If pollination (授粉) is successful, it will take another eight to nine months until the plant matures.

D．This rise has not been without its challenges.

E．The flowers open for just one day a year, so pollination is done completely by hand.

F．But such were the prices it demanded for vanilla that in the 1980s buyers turned their attention to the cheaper, poor-quality version available elsewhere, in particular Indonesia.

10 . 听下面一段独白，回答以下小题。
1. How many natural Christmas trees did Americans buy in 2016?

A．Less than 35 million trees.	B．More than 10 million trees.
C．More than 24 million trees.	D．Less than 24 million trees.

2. What happens to most real Christmas trees after the Christmas season?

A．They are grown once again.	B．They are delivered to a tree farm.
C．They are safely stored away.	D．They are thrown away.

3. What happens to most artificial Christmas trees after the Christmas season?

A．They are moved to a landfill.	B．They are reused next year.
C．They are cut into pieces.	D．They are exchanged for real trees.