单项选择题

Question 29 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question.

A．To find ice.
B．To find living creatures.
C．To measure the atmosphere.
D．To see if the water on it can support lif

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单项选择题

单项选择题

Question 29 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. 您的浏览器不支持 audio 元素。