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Questions 17- 20 are based on a talk on loud noise and sea animals. You now have 20 seconds to read Questions 17 - 20. What was the reaction of the sea animals in the sound tests

A．They were frightened and distressed.
B．They swam away when the speaker was turned on.
C．They swam closer to" examine" the speaker when it was turned off.
D．They didn’t seem to be frightened and kept swimming near the speaker.

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What’s the proportion of Americans who said they were very happy in 1996

A．30%.
B．35%.
C．37%.
D．39%.

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For what purpose were radio transmitter used

A．To attract more sea animals to the testing site.
B．To drive dangerous sea animals away from the testing site.
C．To help track the sea animals being tested.
D．To determine how sea animals communicate with each other.

Questions 17- 20 are based on a talk on loud noise and sea animals. You now have 20 seconds to read Questions 17 - 20. What was the reaction of the sea animals in the sound tests 您的浏览器不支持 audio 元素。

Questions 17- 20 are based on a talk on loud noise and sea animals. You now have 20 seconds to read Questions 17 - 20. What was the reaction of the sea animals in the sound tests