2. 外语
  3. In 1969 two American astronauts ______ on the moon and walked on its rocky, dusty surface.

In 1969 two American astronauts ______ on the moon and walked on its rocky, dusty surface.

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问题 In 1969 two American astronauts ______ on the moon and walked on its rocky, dusty surface.
选项 A、concentrated
B、based
C、landed
D、focused
答案C
解析 concentrate的意思是“专心，集中”，例如：I tried to read a few pages，but I found it hard to concentrate．我试图看几页，可是很难集中精力。base的动词意思是“以……作基础”，例如：Their relationship was based upon mutual respect．他们的关系是以相互尊重为基础的。focus的动词意思是“(使)聚焦，集中”，例如：He stared out the window for a moment，trying to focus his thoughts．他朝窗外凝视了一会儿，试图使自己集中精力。
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