2. 外语
  3. Some insects have a life ______ of no more than a few hours.

Some insects have a life ______ of no more than a few hours.

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问题 Some insects have a life ______ of no more than a few hours.
选项 A、potential
B、span
C、scale
D、scope
答案B
解析 名词词义辨析题。life span意为“寿命”，故答案为B。potential“潜力”；scale“尺度，级别，规模”；scope“(活动或观察的)范围，能力”。
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