1 . Britain has a stubborn enemy called the “devil plant”, the Japanese knotweed (虎杖). The name originated in Japan, but it became a promoter behind a plant disaster in Britain. Initially it was introduced to England as a landscape plant. However, over time it has evolved into a harsh plant difficult to control.
The plant is disreputable (坏名声的) mainly because of its strong ability to survive. The Japanese knotweed can grow at an amazing speed. What’s more, Japan’s knotweed is penetrating. As long as you give it a small gap, it can follow it and make rapid growth. This gap may be a crack in the road, or a wall crack in the house, and even some Japanese knotweed will start to grow from the foundation of the house, gradually “destroy” the whole house. Such an invasion (入侵) is a nightmare for the British. The British simply love and hate the plant, but so far, they are still unable to find an effective way to remove it.
Fortunately, China’s knotweed is not identical to Japan’s, and in the China’s ecosystem, there are many natural enemies against it. As a result, China has not experienced a knotweed invasion as severe as Britain. Additionally, its tender stem can be made into delicious food. The root of knotweed is a very good Chinese medicine. Therefore, in some places there’s also a need to plant knotweed, to obtain economic benefits.
This case gives us a profound inspiration that it is important to be careful when introducing alien species and to fully understand the characteristics of plants or animals and the effects they may cause in a new environment, otherwise it may be easy to spend a huge amount of money every year to clean up the Japanese knotweed, as in the UK.
1. Why did Britain bring in Japanese knotweed at first?| A．To make profits. | B．For decoration. |
| C．For scientific research. | D．To promote biodiversity. |
| A．Fading away. | B．Dying out. |
| C．Multiplying rapidly. | D．Growing steadily. |
| A．China’s ecosystem is not damaged by knotweed. |
| B．Knotweed is in great demand in the whole China. |
| C．Knotweed has made most of the Chinese people rich. |
| D．Chinese medicine includes knotweed’s stems and roots. |
| A．A Natural Phenomenon We Know |
| B．A Plant That People Love and Hate |
| C．Alien Species’ Effect on the Local Economy |
| D．The Fight Against Invasive Plants and Animals |
2 . Thirsty or stressed plants do not suffer in silence. Instead, they make high-pitched(尖锐的) sounds, according to a study published in the journal Cell.
The reason why you have probably never heard the plants’ sounds is that most humans are only able to hear sounds as high as 20 kilohertz (kHz), but the plants made sounds mostly between 40 and 80 kHz, Lilach Hadany, a co-author of the study at Tel Aviv University, tells Business Insider’s Marianne Guenot.
Plants, obviously, do not have organs to make sounds. Lilach says, the present popular theory on how they make noises centers on plants’ xylem(木质部), the tubes that transport water from their roots to their stems(根茎) and leaves. In the process of transporting, when an air bubble(气泡) forms or breaks in the xylem, it might make a little noise; bubbles are more likely to form when a plant is suffering from drought. But the exact process requires further study, Lilach explains.
To listen in to plants, Lilach and her co-workers placed tobacco and tomato plants in small boxes equipped with microphones. First, they stopped providing water to some plants in the boxes and cut the stems of others. Then, the microphones were used to pick up any noises made by the plants even though they couldn’t hear them. Researchers found that the sounds did show the specific types of stresses plants were experiencing. Thirsty tomato and tobacco plants made an average of about 35 and 11 sounds per hour, individually, while cut tomato and tobacco plants made 25 and 15 noises per hour.
In theory, these recorded sounds could help farmers know about which crops are most in need of water. “When more and more areas are exposed to drought due to climate change, efficient water use becomes even more important, for both food security and ecology,” Lilach with her co-workers write.
1. Why do humans fail to hear the sounds of plants?| A．The sounds are stressful. |
| B．The sounds are beyond human’s hearing range. |
| C．The sounds are low-pitched. |
| D．The sounds are between 20kHz and 40kHz. |
| A．Suffering from lack of air. |
| B．Stems and leaves transporting water. |
| C．More air bubbles gathering in the roots. |
| D．Air bubbles’ forming or breaking in the xylem. |
| A．Noises can be picked up by microphones. | B．Plants make more sounds in small boxes. |
| C．Cut plants suffer the same as thirsty ones. | D．Different sounds indicate plants’ stress types. |
| A．To harvest the crops. | B．To solve the food problem. |
| C．To locate the thirsty crops. | D．To prevent climate change. |
3 . Digging out potato tubers (茎块) is one of the greatest rewards gardens have to offer. Children in particular are surprised at seeing these tubers that almost magically become chips, mash (泥) or baked potatoes.
Happily, potatoes are very easy to grow. Seed tubers are placed in good garden soil, ideally with some compost (堆肥) for every square meter, in a sunny spot, about 10cm deep at 30cm intervals in rows 60-70cm apart.
Seed tubers are offered as earliest and second earliest and maincrop. The second earliest and maincrops can be stored for winter use but earliest are usually consumed in summer.
Seasoned potato growers buy early seed potatoes in February and place them in a cool, reasonably light place and let them sprout (发芽). It takes six weeks for small sprouts to form.
Early potatoes are typically planted from middle March in the South, but are likely to emerge before the first season finishes in May. The shoots are frost-sensitive requiring protection on cod nights with either earth or newspapers.
Second early and maincrop potatoes are planted in middle April—the frost risk will be low, but not absent, by the time they emerge. As the stems (茎) grow, soil should be drawn around them until the leaves meet in the row in early summer. At this stage, the potato field is a series of ridges (脊，垄). The tubers form in the ridge, protected from light that turns them green. Covering with black plastic or a thick layer of compost is also accessible instead of ridging, but plastic is not sustainable and slugs (鼻涕虫) can multiply in compost.
Once the flowers are fully open, it is time to dig plants when the tubers are the size of a hen’s egg. They grow rapidly but gradually lose their juicy new potato flavour, so harvest freely.
1. What’s the writing purpose of paragraph 1?| A．To describe a magic process. |
| B．To recall a childhood memory. |
| C．To raise a potato-related topic. |
| D．To introduce a gardening award. |
| A．The closer the intervals are, the faster they will grow. |
| B．The warmer the weather is, the better they will grow. |
| C．The earlier they are planted, the healthier they will grow. |
| D．The deeper they are planted, the stronger they will grow. |
| A．Frost. | B．Plastic. | C．Ridges. | D．Slugs. |
| A．How to cook potatoes. | B．How to grow potatoes. |
| C．How to harvest potatoes. | D．How to preserve potatoes. |
4 . In a tiny, lab-grown garden, the first seeds ever sown in lunar dirt have come up. This small crop, planted in samples (样本) returned by Apollo tasks, offers hope that astronauts could someday grow their own food on the moon.
But plants planted in lunar dirt grew more slowly and were thinner than others grown in volcanic(火山的) material from Earth, researchers report 12 May in Communications Biology. That finding suggests that farming on the moon would take a lot more than a gardening skills.
“Ah! It’s so cool!” says a botanist (植物学家) Richard Barker. “Ever since these samples came, back, there’s been botanists that wanted to know what would happen if you grew plants in them,” says Barker, who wasn’t involved in the study. “But everyone knows those precious samples are priceless, and so you can understand why NASA was unwilling to publish them.”
The team planted seeds in tiny pots that each held about a gram of dirt. Four pots were filled with samples returned by Apollo 11, another four with Apollo 12 samples and a final four with dirt from Apollo 17. Another 16 pots were filled with earthly volcanic material used in past experiments to copy moon dirt. All were grown under LED lights in the lab and watered with nutrients.
“Nothing really compared to when we first saw the seedlings as they were coming up in the lunar dirt,” says Anna-Lisa Paul, a plant biologist. “That was a moving experience. We could not speak when we watched the very first plants growing in unique materials.”
Plants grew in all the pots of lunar dirt, but none grew as well as those planted in earthly material. “The healthiest ones were just smaller,” Paul says. The moon-grown plants were tiny. Faced with that, explorers need to do more research to let plants grow strongly on the moon. I believe we will succeed in time.
1. What does the research on plants grown in the lunar dirt show?| A．Growing foods on the moon is necessary. |
| B．Skills are the key to farming on the moon. |
| C．Farming’ on the moon needs many factors. |
| D．Astronauts want to grow food on their own. |
| A．Some plants need planting in special soils. |
| B．Botanists are interested in studying new things. |
| C．It is a selfish action for NASA to keep the secret. |
| D．The samples brought from the moon are valuable. |
| A．It is practical. | B．It is hopeful. |
| C．It only attracts astronauts. | D．It challenges most experts. |
| A．The First Plant Has Been Grown in Moon Dirt |
| B．Astronauts Have Brought Things Worth Spreading |
| C．Botanists Have Found a New Kind of Plant Lately |
| D．Farming on the Moon Has Been Accepted by People |
5 . Do you know how blueberries (蓝莓) grow？They grow on bushes. Each blueberry is small and round. Many blueberries can grow on one bush. At first, the blueberries are green. The green berries are not ready to eat yet. They need a lot of sun and rain to help them become fat and sweet. When the berries turn blue, they are ripe and ready to be picked.
Farmers grow blueberries in big fields. The people who live nearby can earn money by helping to pick the blueberries. Each one takes a pail (桶) out to the field and fills it with blueberries. They work fast so that they can fill many pails. They want to earn as much money as they can. When they are done picking, their fingers are blue from the juice of the berries.
After the blueberries are picked, they are put into boxes and sent to stores. People buy the blueberries and take them home to eat. Some people like to wash the berries and eat them one by one. Other people like to cook with blueberries. They make blueberry cakes.
No matter how you eat them, blueberries taste great!
1. What color are the blueberries before they are ripe to be picked?| A．Green. | B．Blue. | C．Red. | D．Black. |
| A．In the mountains. | B．In a greenhouse. |
| C．In the forest. | D．In the field. |
| A．To the food shop. | B．To the farm house. |
| C．To the kitchen. | D．To the kitchen. |
| A．Cooking with Blueberries | B．Things about Blueberries |
| C．The Taste of Blueberries | D．Growing Blueberries |
