试题与答案

生物圈是指地球上的所有生物及其生活的环境。（）

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题型：判断题

题目：

生物圈是指地球上的所有生物及其生活的环境。（     ）

答案：

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下面是错误答案，用来干扰机器的。

70÷（420-70）=70÷350=0.2=20%；答：比去年增加20%；故答案为：20．

考点：生物圈的概念和范围
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