【推荐1】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.

Plants Scream in the Face of Stress

For the first time, researchers appear to have evidence that like animals, those plants deprived of water or     1     (force) to endure bodily harm can let out their pain. The study,     2     has yet to be published in a scientific Journal, adds another dimension to scientists     3     (grow) understanding of how plants detect and interact with their surroundings.

In recent years, it has become very clear that plants are more sensitive than researchers     4     (think). They respond when touched by insects and turn toward sources of light. "Plants are not just robotic stimulus-response devices," said Frantisek Baluska of the University of Bonn in Germany. "They're living organisms which have their own problems/'

Actually making their suffering hearable, however, is another matter entirely.     5     (test) that possibility, a team led by Itzhak Khait, a plant scientist at Tel Aviv University in Israel, placed microphones capable of detecting ultrasonic frequencies (超声波频率)four inches from tomato and tobacco plants. The researcher then either stopped watering them or cut their stems.

Measuring in the range of 20 to 150 kilohertz (千赫).the researchers found that even happy, healthy plants made the occasional noise. But when cut, tobacco plants emitted     6     average of 15 sounds within an hour of being cut     7     tomato plants produced 25 sounds.

    8     researchers aren't yet sure how plants produce these sounds, Khait and his colleagues proposed one possibility in their paper     9     as water travels through the plants' tubes, air bubbles will form and explode, producing small vibrations.

All this "screaming” caused by stress wasn't in a range detectable by human ears. But organisms that can hear ultrasonic frequencies—like mice, bats or perhaps other plants—    10     possibly hear the plants cries from as far away as 15 feet.

【推荐2】阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Working with elephants is one of the most popular volunteer activities in Thailand. And for good reason, these     1     (amaze) creatures are huge, cute, and very intelligent. Often elephants     2     (look) on as gentle animals, but it's good to remember that this isn't always the case.     3     (sad), many elephants have faced terrible treatment, beaten into     4     (give) performances or overworked at money­hungry tourist attractions. A terribly­treated elephant can become angry and kill if it feels threatened.

All that being said, volunteering for elephant     5     (protect) can be a very rewarding experience. The important thing is to find the right opportunity. There are     6     number of elephant sanctuaries (动物保护区) and parks, especially in Thailand. There you can do meaningful work     7     (improve) the lives of elephants. The key is to do your research and watch out for places     8     promise you big money.

If the volunteer organization seems to be paying more attention     9     elephant rides and the elephants giving performances, be careful     10     it is probably not a place with the elephants' best interests in mind.

【推荐3】阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

More than 1,000 elephants face     1     (starve) in Thailand because of the coronavirus crisis. An almost total absence of visitors     2     (mean) that many caretakers are struggling to afford food for Thailand’s 4,000 captive elephants. The animals can eat up     3     200kg of food a day.

Lek Chailert,     4     (found) of the Save Elephant Foundation, told the BBC: “If there is no support     5     (keep) them safe, these elephants, some of whom are pregnant, will     6     starve to death or maybe put on to the streets to beg.” Some elephants maybe sold to zoos or they may     7     (return) to the illegal logging business, which     8     (official) banned the use of elephants in 1989.

“It’s very     9     (hope) until some financial help is received immediately,” Lek Chailert adds. It’s a challenge to keep the animals fed and healthy at     10     best of times but now it’s the dry season, which makes the situation even worse.

【推荐1】阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

David Katz was upset by all the plastic going into the ocean. To help solve the problem, he had a     1    （create）idea to treat plastic like money. Mr. Katz calls his idea the "plastic Bank". The goal of the Plastic Bank is to use plastic to help people solve the problems     2    (gradual）. The Plastic Bank adds a value to plastic waste by paying people to recycle it.

The program began in 2015 in Haiti, a poor island nation with many     3    （problem）of waste plastic. The Plastic Bank has 30 "markets" in Haiti. At the Plastic Bank markets, people can exchange the plastic they've collected for     4    they need. The Plastic Bank markets sell lots of things that local people need. The stores also allow plastic collectors to use the money they earn to pay     5    health care or school.

To make sure that the plastic     6    （recycle）, the Plastic Bank works with partners, who agree     7    （use）the plastic that is collected. When customers buy these products, which are labeled "Social Plastic", they know that they are both helping people in other parts of the world     8    keeping plastic out of the ocean. So far, the Plastic Bank     9    （keep） about 7 million pounds of plastic out of the ocean. It makes a great     10    （contribute）to the ocean.

【推荐3】语法填空

Butterfly conservation is a professional term describing the work of a variety of     1    (organize) worldwide that ask for help in species recovery efforts, and public education towards the goal of protecting the     2    (endanger) butterfly species in the wild. They     3    (actual) exist in many countries, including the United Kingdom and the United States.

The at-risk butterflies face a variety of threats. These include the reduction of breeding(繁殖) or habitat because     4     the act of cutting down trees or natural disasters. Other factors that     5    ( threat) some varieties of butterflies include hunters, diseases and so on. Butterfly conservation efforts manage     6    (reduce) the influence of these threats on specific butterfly species.

In the process of butterfly conservation, the nature of recovery efforts can be different     7    (depend) on the needs of a specific population. Some zoos have been engaging in the captive rearing(圈养) and the wild release of certain butterfly species.     8     example of another type of butterfly recovery effort was     9     they released many caterpillars(毛毛虫) into two United States national parks to support a wild population of Miami blue butterflies in 2004. In some areas, landowners can offer personal help by making     10    (they) house a designated(指定的) backyard habitat for butterflies.