第二部分 阅读理解（共 20 小题；每小题 2 分，满分 40 分）

第一节 阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。

The Coolest Inventions

An Oceans Vacuum

　　There's a collection of plastic trash in the middle of the Pacific Ocean. It's bigger than Texas and growing. The way to clean it up now is to catch it with nets. That is both costly and slow. Instead, the Ocean Cleanup Project proposes a 62-mile-long floating barrier that would use natural currents to trap trash. If next year's trials succeed, a full cleanup operation would aim to start in 2020. It could reduce the trash by 42 % over 10 years.

Easy-On Shoes

　　In 2012, Matthew Walzer, a high school student with a disability, sent a note to Nike. "My dream is to go to college," he wrote, "without having to worry about someone coming to tie my shoes every day." Nike assigned a design team to the challenge. This year, they came out with their solution: the FlyEase. The basketball shoe can be fastened with one hand. A pair of Nike FlyEase shoes sells for $ 130.

An Airport for Drones (无人机）

As Amazon, Google, and others get ready for drone delivery service, there is one big question: What kinds of home bases will their drones have? Rwanda, in Africa, may have the answer. There, workers will soon start work on three "drone ports". The goal is to make it easier to transport food, medical supplies, electronics, and other goods through the hilly countryside. Construction is set to be completed in 2020.

21. What's the advantage of the Oceans Vacuum?

A. It can tear plastic into pieces. B. It can grow year by year.

C. It can be a money-saver. D. It can be put into wide use soon.

22. What do we know about Nike?

A. It offers free shoes to the disabled.

B. It provides customer friendly services.

C. It is designing new shoes frequently.

D. It responded to Matthew's request passively.

23. Why is Rwanda setting up "drone ports"?

A. Because they are receptive to new technology.

B. Because they're easier to construct than roads.

C. Because there are too many drones.

D. Because road travel there is rough.