2. 外语
  3. Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.

Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.

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问题 Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.
选项 A、inclined to
B、subjected to
C、prone to
D、bound to
答案B
解析 根据常识可知，空格处应填表“须经……的”之义的词，故subjected to“经受，经过……”符合题意，选B。be inclined to表示“倾向于……”，be prone to表示“易于……”。be bound to表示“负有义务的，受……约束的”，如：You are legally not bound to answer these questions．(在法律上你没有义务非回答这些问题不可。)
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