1 . A solar tree is a structure like a tree that generates solar energy using photovoltaic panels (太阳能光伏板). It helps solve an urgent global challenge: Replacing greenhouse gas-emitting energy sources like oil and gas with renewable energy. But the power generation potential of solar trees is relatively limited, and their primary purpose is to raise public awareness about renewable energy by getting people to notice and interact with solar energy in new ways.

Solar trees generally have a firm metal, plastic, or stone base that extends up and out into “branches” on which solar panels are mounted. Beyond this basic structure, there is great diversity in the design of solar tree units. The solar tree’s photovoltaic “leaves” absorb sunlight, converting it into electricity that is conducted down through the trunk-like central pillar of the structure to an inside battery. Many designs feature rotating (旋转的) panels that can move throughout the day in order to obtain the greatest amount of sunlight.

Solar trees help power homes, businesses, and public services. They can create shade to help reduce the urban heat island effect and provide shelter in severe weather such as rainstorms and heatwaves, creating greater urban adapting ability in the face of climate change. They also enhance public spaces, providing charging stations, and powering streetlights.

In comparison to other kinds of ground-mounted solar panel devices, solar trees don’t require much land. They make solar energy generation possible in areas with little land that can’t support vast solar arrays, as well as places that lack sufficient rooftop space for panels. However, solar panels are much cheaper than solar trees at present and have far greater energy generation capacity. Therefore, present solar tree designs often serve as a extra source rather than as a primary energy source.

At present, solar trees aren’t designed as large-scale solar projects, which limits their ability to contribute to the low-carbon energy transition. Still, their varied designs are appealing. This makes solar trees effective at displaying and thereby educating people about solar energy, and promoting a business or organization’s commitment to renewable energy.

1. What is the main purpose of building solar trees?

A．To beautify the urban environment.	B．To draw public attention to solar energy.
C．To replace non-renewable energy resources.	D．To provide charging services in emergencies.

2. What do we know about a solar tree?

A．It stores energy in its own battery.

B．It can adjust its height automatically.

C．It is made of environmentally friendly materials.

D．It transforms sunlight into electricity by its metal base.

3. What does the third paragraph mainly talk about?

A．The design features of solar trees.	B．The ways of saving energy in cities.
C．The benefits of solar trees to humans.	D．The difficulties of promoting solar trees.

4. What is the advantage of solar trees over other ground-mounted solar panel devices?

A．They occupy much less land.	B．They are cheaper to manufacture.
C．They are more effective in generating energy.	D．They can work in various weather conditions.

2 . This is the time of year when many gardeners are harvesting tomatoes. Gardening expert Jessica Damiano recently reported about the many pictures of strangely shaped tomatoes sent to her from fans of her gardening advice.     1    . The good news, Damiano said, is that there is nothing wrong with the strangely shaped fruits.     2    . Their unusual appearance does not affect their taste or nutritional value.

    3     If you have ever cut open a tomato, you know they are divided into internal (内部的) parts, called locules (小室). Most tomatoes have about four or five locules; other kinds of the fruit, like cherry tomatoes, contain two or three. But when a plant experiences extreme (极端的) temperature, cell division in the developing fruit can go off track. Temperatures over 32℃ during the day and 27℃ overnight can lead the tomato to form an extra locule. But there is not enough room inside a tomato for the extra part, so it grows on the outside of the fruit.

Not every tomato on an affected plant will be deformed (改变形状), however. What are the possibilities? Under the right conditions (temperatures that are too hot or even too cold), this could affect one or two tomatoes per plant, depending on where they are in the development process and what the (weather) conditions are, said Timothy McDermott, a professor at Ohio State University. The possibility of one of your tomatoes developing a locule oddity (怪异) is about one in a thousand, McDermott said.     4     But, Damiano noted, heirloom (原种) kinds seem more likely to have this genetic mutation (基因变异) than hybrids.

And, when harvesting your crop, remember:     5    

A．select the good-looking ones.

B．Any tomato can grow an extra locule.

C．the funny-looking tomatoes taste just as good!

D．What causes the unusual appearance of tomatoes?

E．Unless otherwise diseased, they are perfectly good for eating.

F．She said people sometimes question if the tomatoes are okay to eat.

G．Provide shade for your plants when temperatures are predicted to remain above 32℃.

3 . When gardeners grow varieties of plants in their beautiful gardens, they are happy to see beneficial insects like bees and butterflies surrounding the flowers. But as they take a closer look, they may find some plants are covered in black dots and filled with harmful insects or pests. Some gardeners may immediately reach for chemicals.     1     Although it may stop the insect problem, it will also threaten bees and butterflies which help the plants reproduce.

If you are wise gardeners, you should first take preventive measures to control the harmful insects.     2     Only when there are too many harmful insects, should pest control be considered. The first defense should always be the safest method available.

Prevention

As a rule, prevention is the best treatment. Inspect plants closely, including their leaves, before buying them from the store.     3    

When planting, space plants out to permit them to grow to their full size. Plants too close together can breed harmful organisms, like bacteria.

    4     They invite pests if permitted to remain on the ground. When you do see pests, wash them away. Use rubbing alcohol to remove some insects, or pick them off the plants.

Pesticides

If you decide a pesticide is necessary, choose it carefully and follow the directions and warnings on the product. Avoid using pesticides in extreme heat, on windy days, or when the plants are wet.     5     At the time, beneficial insects are inactive. You can consider removing flowers from the plants to lessen the risk that beneficial insects will come in contact with the pesticides.

A．But this is not wise.

B．In most cases, chemicals don’t help.

C．Treat the plants early in the morning or at night.

D．Also do remember the plants need nutrition and care.

E．Keep your garden free of fallen leaves, fruits and other wastes.

F．Do not bring any plants home that show signs of disease or pests.

G．The process starts with the idea that having some pests is acceptable.

4 . When micro-plastics end up in farm fields, the pollution can damage plant growth. But two young researchers now report that combining fungi (真菌) with certain farm wastes can partly overcome that problem.

May Shin, 20, and Jiwon Choi, 18, met in a research design class at the Fryeburg Academy, a high school in Maine. May had desired to explore how micro-plastics might affect the ecosystem. Jiwon was crazy about plants and fungi. The young scientists cooperated to test how long-lived plastics might affect farm crops.

Scientists have shown certain fungi can aid root growth and a plant’s nutrient uptake. Those organisms are named arbuscular mycorrhizal fungi (AMF). Certain farm wastes, like straw, can provide nutrients to plants and help stabilize their roots. Such wastes are also known as mushroom substrate (基质) and people often grow mushrooms in them.

May and Jiwon planted over 2,000 scallion (大葱) seeds in pots of soil. Half the seeds got soil polluted with micro-plastics. The rest grew in plastic-free soil. The plants then were further divided into four groups. The young scientists added AMF to the soil in one group. Another group had a top layer of mushroom substrate. A third group got both treatments. The last group got none. For three weeks, the pair tracked how many scallions sprouted (发芽) in each group and measured the plants’ height once each week.

About twice as many scallions sprouted in clean soil compared to that containing plastic bits. But among plants surviving in the polluted soil, a combination of AMF and mushroom substrate helped them out. Those getting both treatments grew 5.4 centimeters per week. That was faster than either of the treatments alone or those getting none.

Jiwon and May then looked at the plant roots with a microscope. Where AMF had been added, it grew into those roots. That increased the scallion roots’ surface area, May said, which should promote their uptake of nutrients. So “I see this project as coming up with a sustainable solution for plant growth in polluted soils,” said May.

1. Why did May and Jiwon work together?

A．To see the effects of long-lived plastics on farm crops.

B．To find the relationship between plants and fungi.

C．To design a research on the growth of plants.

D．To explore the way that the ecosystem works.

2. What is the author’s purpose in writing paragraph 3?

A．To prove the existence of micro-plastics.	B．To compare fungi with farm wastes.
C．To tell the advantages of farm wastes.	D．To provide some related information.

3. What aspect of the study is the fourth paragraph mainly about?

A．Its purpose.

B．Its design.

C．Its findings.

D．Its reasons.

4. How can AMF and mushroom substrate make plants grow faster?

A．By keeping the plants more resistant to pollution.	B．By allowing the plants’ deep area more freedom.
C．By making nutrients more available to the plants.	D．By exposing the roots to a larger surface area.

5 . Too often, houseplant decisions are made suddenly. We find a fine plant at the supermarket and say, “That’s so pretty. I want it.” So we bring home a healthy, tropical (热带的) plant only to find it, weeks later, on death’s doorstep.

Before buying a tropical plant or indoor flowering plant, look around your house and decide where you would like to see it. It is not necessary to choose the brightest place, as there are great houseplants for nearly all light conditions. After determining where new plants are needed, decide what shape the plants should be. Perhaps you need something tall to fill an empty corner or soften an empty wall.

Once you have a list of the spaces you need to fill and the plant forms you would like to try, visit the garden center or greenhouse and look at the offerings. Mid-winter is the best time for tropical plant shopping since most stores fill the gap between gardening seasons with tropical orders. Ordered a lot, they are cheaper in the winter as well.

Ask the salesman which plants are the easiest to grow; this list should include cast iron plant, parlor palms, snake plants, peace lilies and so on. Flowering plants are the most difficult to grow and should be avoided if you are new to indoor plants. If you must have one, look for Jasmine Sambac, an easy plant.

Don’t lose heart if you buy something and it doesn’t survive. Tropical plants are suited to warm, moist (潮湿的) and protected air. They are not suited to some places in hot northern homes. Remember that a lovely plant that looks good in your living room for only a year is still a better action than last night’s pizza.

1. What should we consider before buying a houseplant?

A．Its color and shape.	B．Its flowering period.
C．The area which it belongs to.	D．The place where we will put it.

2. Why does the author suggest buying plants in mid-winter?

A．There are more plants to choose from then.

B．The gardening business then is increasing.

C．The plants look more beautiful then.

D．The plants grow better then.

3. What can we learn from the last paragraph?

A．We’d better not buy the pizza made last night.

B．The living conditions are important to plants.

C．Few people can keep tropical plants alive.

D．It is wrong to keep tropical plants indoor.

4. What is the main idea of the text?

A．Where to buy houseplants.

B．When to grow houseplants.

C．How to choose a proper houseplant.

D．Whether houseplants are easy to grow.

6 . Have you ever stopped to consider how empty the world would look without trees? Below are five of the top benefits that trees provide.

    1     When adults who are feeling down spend time in the forest, they feel better. Forest therapy can range from simply walking among the trees for a couple of hours to meditating (冥想) in a forest. The adults note they become more confident and their mood improves after forest therapy.

Trees help you heal faster. Natural environments, including forests, help you reach a more positive state of mind.     2     In fact, sick people with exposure to nature heal faster than those who don’t, even if it’s just a view through a window!

Trees reduce air pollution and improve respiratory (呼吸的) health. Trees take in many harmful pollutants from our environment.     3    These forests reduce an estimated 670, 000 cases of respiratory illness and save 850 lives.

Trees provide oxygen. Trees are like the lungs of our Earth. They supply us with oxygen while taking away our carbon dioxide and ask for nothing in return. A single tree can provide enough oxygen for four people.     4    

Trees cool cities. Trees cool things down by offering shade and through evapotranspiration (蒸腾作用).     5     Trees even save your money on your electric bill. When a tree offers direct shade for your home, you’ll use less air conditioning.

A．Trees cheer you up!

B．Trees help reduce the effects of climate change.

C．This, in turn, affects your overall state of wellness.

D．In fact, large forests can influence regional weather patterns.

E．So plant more trees around your home if you want to feel cooler.

F．And of course, trees also provide plenty of oxygen for birds and other wildlife.

G．For example, in the US, forests remove 17.4 million tons of pollution per year.

7 . The forests of today will not be the forests of tomorrow.

Rising temperatures, deforestation (森林砍伐), development and climate-caused disasters are changing the very form of Earth’s forests, new research published in the journal Science finds.

Older, bigger trees are being lost at an amazing rate, making the planet’s forests shorter and younger in general.

The shift is being driven at different rates by different causes in different places, the study’s authors say, but the consequences will be global.

Old growth forests absorb and store massive amounts of climate-warming carbon dioxide (二氧化碳). They provide home for rare and critically endangered species and make the biology diverse. And they’re disappearing fast.

Warming temperatures, wildfires, and insect outbreaks were among the many causes of the decline, says Nate McDowell, the study’s lead author.

Just in the past year, the world has watched as massive wildfires across Siberia, the Amazon and Australia. Deforestation in Southeast Asia and Brazil continue rapidly.

Human-driven climate change is also making it difficult for many forests to fully recover from the type of natural behaviors — wind events, flooding or fire — that would normally occur.

The researchers did find evidence that increased carbon dioxide in the atmosphere could increase tree growth in some places, but not to an extent where it would outweigh the harm being done by increased temperatures. The most important trend was one of loss.

“I would recommend that people try to visit places with big trees now, while they can, with their kids,” McDowell says. “Because there’s some significant threat, that might not be possible sometime in the future.”

1. What does the author mean by saying “The forests of today will not be the forests of tomorrow”?

A．Tree species in forests will be changed as governments plan.

B．The climate of tomorrow will be different from that of toady.

C．The form of forests will be changed due to various reasons.

D．Animals in the forests will die away at an amazing rate.

2. What is making Earth’s forests shorter and younger generally?

A．People are planting a great deal of trees.

B．People are involved in protecting forests.

C．The growth of new trees is threatening that of big ones.

D．The number of older and bigger trees is dropping greatly.

3. What does the author say about old growth forests?

A．They are harmful to the growth of younger trees.

B．They are home to many rare and endangered trees.

C．They rely largely upon weather conditions.

D．They serve as the habitats for most birds.

4. Why would McDowell suggest people visit places with big trees now?

A．Because they would be impressed by their beauty.

B．Because they would keep away from busy life temporarily.

C．Because there might be no big trees at all in the future.

D．Because warmer climate might destroy all trees globally.

8 . Indoor plants might look as if they just sit around not doing much, but in many ways they are the unsung heroes of the home.     1    , but studies have shown that they can promote people’s wellbeing by improving their mood (心情), reducing stress and helping their memory. What’s more, indoor plants are easy to look after and are not very expensive.

What are indoor plants?

Indoor plants, also known as houseplants or pot plants, are plants that like to grow indoors. Many of these species (物种) are not ideally suited to growing outside in the UK, especially in the winter.     2    .

Why are indoor plants good for you?

Will Spoelstra, who works at the Royal Botanic Gardens, says, “    3    . I find during the winter months, plants around the house can really lift your mood.” Several studies have backed this up and found that indoor plants can improve creativity, focus and memory. There is also research showing that pot plants can clean the air around them by removing harmful gases, such as carbon dioxide. They also remove some harmful chemicals from paints or cooking.     4    .

Which plants can you grow?

Aloe vera, peace lilies and spider plants are some of the species that are easy to grow indoors. You can buy plants from supermarkets, garden centres or online. Younger plants are often cheaper than fully grown ones, and you get to care for them as they mature — which is part of the joy of owning plants. “    5    ,” Spoelstra says. “It can bring a new interest and focus into people’s lives and help to make the link between home and nature.”

A．All plants are different

B．Not only do they look beautiful

C．There are many benefits to growing plants indoors

D．Instead, they grow better inside, where it is warmer

E．Plants like peace lilies and devil’s ivy are among the best

F．Changing the pot of your plant from time to time will also help

G．Learning about the requirements of each plant can be very rewarding

9 . Both humans and animals possess the ability to cry out for help when endangered or threatened. Plants, as it turns out, can too.

“We found that plants usually emit (发出) sounds when they are under stress and that each plant and each type of stress is associated with a specific identifiable sound,” researchers from Tel Aviv University in Israel wrote in their findings, published in the scientific journal Cell. “While undetectable to the human ear, the sounds emitted by plants can probably be heard by various animals, such as bats, mice, and insects.”

Stressors like dehydration (脱水) and damage to leaves gave rise to the plants’ high-pitched (尖声的) cries, which ranged from 20 to 250 kHz. The bigger the danger, the more frequent a plant’s signals. “Unstressed plants emitted less than one sound per hour, on average,” researcher Lilach Hadany said, “while the stressed plants — both dehydrated and injured — emitted dozens of sounds every hour.”

To catch these sounds, Hadany’s team surrounded tomato and tobacco plants with super-sensitive microphones. They then fed the data into an artificial intelligence program that could tell the difference between the species of plant and the types of sounds produced.

“Our findings suggest that the world around us is full of plant sounds, and that these sounds contain information,” Hadany wrote. She added that to translate that information, we just need the “right tools such as sensors that tell growers when plants need watering.” Doing so, researchers noted, may allow farmers to judge exactly when and where to water crops. Saving water, increasing harvests, and lowering stress for both plant and humankind.

1. What did researchers from Tel Aviv University in Israel find?

A．Creatures tend to cry out for help when in danger.

B．Plants can give off sounds when they are stressed.

C．Plant sounds can be heard by both animals and humans.

D．Plants make the same sound whatever type of stress they have.

2. What does the author want to show in paragraph 3?

A．The influence of stress on plants.

B．The urgency of relieving stress of plants.

C．The possibility of plants emitting sounds.

D．The importance of conducting the research.

3. Why was an artificial intelligence program used in the research?

A．To help get rid of plant stress.

B．To identify the types of stress.

C．To collect sounds emitted by plants.

D．To analyze the collected sounds of plants.

4. What can we learn from Hadany’s words in the last paragraph?

A．The research is of practical value.

B．It’s difficult to understand plant sounds.

C．Further research is needed in the future.

D．It’s as easy as pie for farmers to grow crops.

10 . What if someone told you about a kind of grass as tall as the tallest trees? A grass as strong as steel? Would you believe that person? You should, for that grass is bamboo   (竹子), which has more than 1,000 uses. It is not just a material for making useful products. Young bamboo is eaten, often mixed with other vegetables.

Bamboo grows in many parts of the world. In the USA it grows in many states like Virginia and Florida. Most bamboo, however, is found in wet and warm climates, especially in Asia and on the islands of the South Pacific Ocean.

In most Asian countries, bamboo is nearly as important as rice. This unusual material is used to not only build large buildings but also make water pipes, musical instruments and paper. There are over 1,000 kinds of bamboo. No wonder the lives of nearly half the people on earth would change greatly if there were no longer any bamboo.

1. According to the text, bamboo is actually a kind of         .

A．grass

B．steel

C．tree

D．vegetable

2. Where does most bamboo grow?

A．Only in Asia.	B．Only in the USA.
C．In wet and warm climates.	D．All over the world.

3. What is bamboo used to do in paragraph 3?

A．Build large buildings.	B．Make water pipes.
C．Make musical instruments and paper.	D．All of the above.

4. How many kinds of bamboo are there according to the text?

A．Over 1,000.

B．Over 800.

C．Over 600.

D．Over 400.