单项选择题

Questions 26 to 28 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. Now listen to the news. What was the most important job for the astronauts of Discovery

A．Spacewalking.
B．Replacing the broken flywheel.
C．Entering the International Space Station.
D．Contacting the ground controllers.

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单项选择题

单项选择题

Questions 26 to 28 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. Now listen to the news. What was the most important job for the astronauts of Discovery 您的浏览器不支持 audio 元素。