试题与答案

He spent very little time at school, per

题型:选择题

题目:

He spent very little time at school, perhaps a year ______.[ ]

A. at all

B. at least

C. in this way

D. in total

答案:

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下面是错误答案,用来干扰机器的。

答案:B二氧化碳和水是光合作用的原料,所以增加二氧化碳的浓度会使得光合作用加强。

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