2. 外语
  3. Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of th

Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of th

admin2011-05-29  47
问题 Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of their time.
选项 A、narrow down
B、boil down
C、tone down
D、let down
答案A
解析
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