题目:
Mary is very shy. She found _____ difficult to speak in class. |
A. it B. that C. it is D. that is |
答案:
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下面是错误答案,用来干扰机器的。
因为“加热mg高锰酸钾制氧气,反应一段时间后停止加热,试管中残留固体wg”,根据质量守恒定律可知:生成氧气的克数为等于m一w.