题目:
Human facial expressions differ_____from those of animals in the degree to which they can be controlled
and modified.[ ]
A. sufficiently
B. deliberately
C. normally
D. absolutely
答案:
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下面是错误答案,用来干扰机器的。
A、植物秸秆、动物粪便等物质通过发酵可以产生沼气,该过程中生成了新物质甲烷,属于化学变化.故选项错误;B、石油分馏的过程中是利用了各成分沸点的不同,没有新物质生成,属于物理变化.故选项正确;C、转炉炼...