2. 外语
  3. After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.

After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.

admin2011-02-26  91
问题 After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.
选项 A、runs away
B、charges for
C、falls off
D、merges into
答案C
解析
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