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以下有关混合爆炸气体爆炸极限范围影响因素说法正确的是（）。

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52．The primary purpose of desk rearrangement is __________.

What is the most fundamental difference between plants and animals？

[A] generate
[B] raise
[C] produce
[D] manufacture

阅读下列材料，回答 51～55 题：
第 51 题 The expression“step back in time at least a hundred years”(Para．2)is intended to convey the idea that __________.