What is the news item mainly about?

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问题 What is the news item mainly about?
NASA astronauts successfully installed a new ammonia pump on the International Space Station Monday during their third spacewalk to make the emergency repairs. The astronauts do not yet know whether their efforts were enough to restore the space station’s cooling system to full capacity.
    It took three spacewalks, totaling more than 22 hours, but astronauts Doug Wheelock and Tracy Caldwell Dyson managed to move the 350-kilogram replacement pump into position. They tightened bolts and made connections so ammonia could flow into the module.
    NASA called the success "a big step in the right direction". The space station’s cooling system has been running at half capacity for more than two weeks. On July 31, an ammonia pump failed. Another module continued to pump coolant through a separate loop, but astronauts had to power down non-essential equipment to prevent overheating.
    The space station’s deputy program manager, Kirk Shireman, said the team did an outstanding job coping with what he called "a major malfunction".

选项 A、U.S. astronauts made three space walks.
B、An international space station was set up.
C、A problem in the cooling system was solved.
D、A 350-kilogram ammonia pump was removed.

答案C

解析 新闻开头提到,美国航天局的宇航员成功为国际空间站完成紧急修理工作,但宇航员还不知道是否能使空间站的冷却系统完全恢复,可见紧急修理的是冷却系统。接着新闻详述了问题所在和修理过程,并于新闻末尾对修理工作予以肯定,称工作组出色地处理了重大故障。因此本则新闻的主旨是冷却系统的问题被解决,答案为[C]。太空行走是修复故障时的行动,是细节内容;新闻中未提到国际空间站的建立,故[B]错误;氮泵是被安装而非移除,故[D]错误。
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