题目内容：

    Boyan Slat is 26. If you saw him walking down the street, you might think he was just a student at a local technical university. And so he was, seven years ago, right before he _________ out of college.

Slat’s life began to _________ after a holiday trip to Greece with his family when he was 16. Before taking a diving course, he had _________ to see beautiful sea animals. However, what he _________ saw in the ocean was an awful lot of _________ waste. From that moment on, Slat dived into a _________ to find a solution to this alarming problem. _________ by the idea for a floating barrier that could collect plastic in the oceans, he _________ his company at the age of 18. Although the idea was named one of the best _________ of 2015 by TIME magazine, he received __________ feedback from the specialists in __________ issues.

Slat was not __________ and continued with his mission. After five and a half years’ hard work, he launched the world’s __________ ocean plastic cleanup system: System 001. The U-shaped pipe, about 609 meters in __________, snakes its way out under the Golden Gate Bridge into the Pacific. These floating barriers will capture (捕获) plastic as the ocean water flow past. Ships will collect the waste and bring it to land for __________ every few months. According to Slat, if all goes to plan, only 60 systems could __________ the amount of plastic there by as much as 50 percent by 2025.

__________, there remains a problem: what will happen to the plastic brought back to shore from Slats systems? It’s likely that lots of the waste will __________ be recycled into more single-use plastics that end up back in the __________. That doesn’t mean Slat will __________. “Big problems require big solutions,” he says. “If anyone has any better ideas, I’d love to know.”

1.A.ran B.dropped C.studied D.grew

2.A.change B.improve C.suffer D.worsen

3.A.failed B.managed C.started D.expected

4.A.suddenly B.actually C.probably D.rarely

5.A.medical B.industrial C.plastic D.agricultural

6.A.project B.book C.lake D.river

7.A.Troubled B.Amused C.Frightened D.Struck

8.A.left B.founded C.sold D.introduced

9.A.inventions B.results C.wishes D.barriers

10.A.positive B.valuable C.negative D.immediate

11.A.legal B.social C.political D.environmental

12.A.discouraged B.abandoned C.pleased D.surprised

13.A.largest B.best C.first D.fastest

14.A.width B.length C.height D.depth

15.A.burning B.burying C.recycling D.testing

16.A.increase B.reduce C.keep D.limit

17.A.Besides B.Therefore C.However D.Otherwise

18.A.eventually B.certainly C.rapidly D.carefully

19.A.ships B.mountains C.dustbins D.oceans

20.A.give back B.give in C.give out D.give up