单项选择题

Questions 21 and 22 are based on the following news. At the end of the news item you will be given 10 seconds to answer the questions.
Now, listen to the news. The Navy plans to send sea lions and dolphins to Naval Base Kitsap-Bangor to______.

A．beat terrorist swimmers
B．protect sea environment
C．do an adaptability test
D．detect potential attackers

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单项选择题

单项选择题

Questions 21 and 22 are based on the following news. At the end of the news item you will be given 10 seconds to answer the questions. Now, listen to the news. The Navy plans to send sea lions and dolphins to Naval Base Kitsap-Bangor to______. 您的浏览器不支持 audio 元素。