单项选择题

Question 26 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now, listen to the news.

A．To visit other planets.
B．To destroy the comet.
C．To collect scientific data.
D．To test the possibility of unmanned spaceship.

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单项选择题

单项选择题

Question 26 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now, listen to the news. 您的浏览器不支持 audio 元素。