2. 外语
  3. Compared to other mammals, humans have a relatively long life______.

Compared to other mammals, humans have a relatively long life______.

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问题 Compared to other mammals, humans have a relatively long life______.
选项 A、length
B、extension
C、expense
D、span
答案D
解析 本题考查近义词辨析。length“长度、范围”；extension“延伸”；expense“开支、花费”；span“注意力、寿命”，常构成life span“寿命，生命周期”。故选D。
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