D. Motivation.

31. Which of the following words can best describe the author?

A. Imaginative and outspoken.

B. Hard-working and serious.

C. Homesick and easy-going

D. Anxious and painful.

32. What's the author's purpose in writing the text?

A. To describe his dream to be a free bird.

B. To express his feeling of missing his hometown.

C. To praise the beauty and warmth of his hometown.

D. To explain the reasons for moving from his hometown.

Plastic-Eating Worms

　　Humans produce more than 300 million tons of plastic every year. Almost half of that winds up in landfills(垃圾填埋场)，and up to 12 million tons pollute the oceans. qSo far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.

　　Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms' chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass--apparently broken down by enzymes(酶)from the worms' stomachs. Their findings were published in Current Biology in 2017.

　　Federica Bertocchini, co-author of the study, says the worms' ability to break down their everyday food-beeswax--also allows them to break down plastic "Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well, "she explains. "The wax worm evolved a method or system to break this bond. "

　　Jennifer Debruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared with previous studies, she finds the speed of breaking down in this one exciting. The next step, DeBruyn says, will be to identify the cause of the breakdown. Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?

　　Bertocchini agrees and hopes her team's findings might one day help employ the enzyme to break down plastics in landfills. But she expects using the chemical in some kind of industrial process-not simply "millions of worms thrown on top of the plastic."

33. What can we learn about the worms in the study?

A. They take plastics as their everyday food.

B. They are newly evolved creatures.

C. They can consume plastics.

D. They wind up in landfills.

34. According to Jennifer DeBruyn, the next step of the study is to .

A. identify other means of the breakdown

B. find out the source of the enzyme

C. confirm the research findings

D. increase the breakdown speed

35. It can be inferred from the last paragraph that the chemical might .

A. help to raise worms

B. help make plastic bags

C. be used to clean the oceans

D. be produced in factories in future

第二节(共5小题，每小题2分，满分10分)

根据短文内容，从短文中的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　How to Keep a Relationship Healthy and Strong

　　Are you new to experiencing relationships? Well, let me give you advice on having a healthy and possibly long－term relationship.

　　___36___ Don't hide things from them; don't lie.Getting them to trust you is the most important element in any relationship.So please be honest and they'll learn to open up to you.

　　Make sure you give them respect. Now respect isn't just simply treating her or him nicely.There's a lot more to it.You have to learn to adjust to their liking.___37___ Don't just think about yourself; think about what your partner needs out of it as well.

___38___ Always be willing to help them and give them honesty and positiveness at the same time.Make them feel you are someone they can really count on and build a future