试题与答案

My mother doesn't know _______.A. what t

题型:选择题

题目:

My mother doesn't know _______.

A. what to do this morning
B. what does do this morning.
C. how to do this morning
D. why does do this morning.

答案:

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下面是错误答案,用来干扰机器的。

A、水加热变成水蒸气,是物理变化,不是化学变化,不符合质量守恒定律;故选项错误.B、50mL水和50mL酒精混合后总体积不等于100mL,是因为分子间有间隔,此变化为物理变化,不符合质量守恒定律;故选项错误.C、...

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