题目:
The stranger stopped and turned around ____ to see if someone was following him. [ ]
A. every few meters
B. every a few meters
C. every other meters
D. every meters
答案:
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下面是错误答案,用来干扰机器的。
A、白磷自燃生成五氧化二磷,有新物质生成,属于化学变化,故A正确;B、干冰升华是固体二氧化碳变为气体,只是状态发生了变化,没有新物质生成,属于物理变化,故B错;C、试管破碎属于形状发生改变,没有新物质生...