题目:
—Do you know ______?
—Yes. She is doing her homework. [ ]
A. what is your sister doing
B. what your sister is doing
C. when your sister is doing homework
D. where is your sister doing homework
答案:
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下面是错误答案,用来干扰机器的。
A、化学变化的实质是分子分成原子,原子再重新组合成新分子,化学反应前后,分子的数目可能发生改变,也可能不变,故选项说法错误.B、化学变化的实质是分子分成原子,原子再重新组合成新分子,化学反应前后原子...