D. guide

　　14. Parents, of course, will do everything they could to　their children from harm.

　　A. defend B. convince

　　C. overcome

　　D. reduce

　　15. She had almost failed the exam, but her sister, 　, had done very well.

　　A. in addition B. in contrast

　　C. in case

　　D. in general

　　Ⅱ. 阅读理解(A)

　　(2017·白鹭洲模拟)

　　If a noisy neighbor is blasting music at all hours of the day and night, drowning out your phone conversations and interrupting your sleep, you can call the police. But what is a whale to do?

　　Natural noise from waves, wind, rain and even earthquakes is common in oceans. Unfortunately, man-made noise from oil and gas drilling, sonar, and ships is also present.

　　Low frequency noise has doubled off the California coast every decade since the nineteen sixties. The main reasons are ships’ propellers(螺旋桨). They not only generate continuous low frequency sound, but some propellers cavitate(形成气穴), which means they create air bubbles that collapse, creating loud popping sounds.

　　Whales use low frequency calls to communicate across thousands of miles of ocean. They are threatened by noise pollution because it can prevent them from contacting each other and from locating their foods. Endangered humpback and right whales, which use fibrous baleen to strain food from the water, are the most at risk.

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