What will be the distinctive feature of the second generation robots? The word "plummet" in paragraph 6 means______.

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问题 What will be the distinctive feature of the second generation robots?
The word "plummet" in paragraph 6 means______.

选项 A、decrease.
B、stretch.
C、extend.
D、grow.

答案A

解析 "plummet"是"急速下降"的意思。也可根据后面的"…eventually to near zero"(最终降到零)判断，stretch，extend，grow的意思是"伸展"，"扩大"或"增长"，因此都不对。

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