项正确。

【4题详解】

主旨大意题。通读全文可知，作者以诙谐幽默的方式讲述了当她得知她比正常人多了三颗智齿之后，家人和朋友如何看待这些智齿的，尤其是自己如何看待这些智齿的。故B选项正确。

【点睛】通过虚拟语气句式的判断也是解推理判断题的重要方法之一。由句子If only I still believed in the tooth fairy，I could make a lot of cash 可知，这是If only引导的虚拟条件句，表示与现在事实相反的假设。因此我们判断出作者意识到这个想法不能成为现实。所以我们判断出小题3的正确选项为D。所以同学们要注意虚拟语气在推理判断题中的应用。

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 goals 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.

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