2. 外语
  3. The population of the world is growing at a dangerous______.

The population of the world is growing at a dangerous______.

admin2016-08-30  9
问题 The population of the world is growing at a dangerous______.
选项 A、step
B、rate
C、measure
D、progress
答案B
解析 本题考查固定短语。at a…rate意为“以…速度”，符合语意。故选B。
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