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Questions 11 to 18 are based on the conversation you have just heard

A．Give up on finding things.
B．Borrow the calculus textbook.
C．Check it at the lost-and-found.
D．Go to get the information.

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The average thickness of Arctic ice has now been reduced by ______.

Questions 11 to 18 are based on the conversation you have just heard 您的浏览器不支持 audio 元素。