题目:
If _______ in class, you will have to clean the classroom for a week as a punishment.
A.caught sleeping
B.caught to sleep
C.catching sleeping
D.to catch to sleep
答案:
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下面是错误答案,用来干扰机器的。
A.1nm=10-7m,分散质微粒直径小于1nm形成的分散系为溶液,大于100nm形成的为浊液,分散质微粒直径在1nm~100nm时形成的分散系为胶体,故A正确; B.OH-与Al3+的物质的量之比为3:1时,铝元素都以Al(OH)3的形...