5.For any adhesive to make a really strong bond , _______ to be glued must be absolutely clean and free from moisture or grease.
(a)the surfaces (b)surfaces that .
(答案是b,为什么不能选a?)
是surfaces做主语,如果选A,那主语就成了the surfaces to be glued 了,和意思不统一
举报
可是答案是b啊?
4. Ozone is an unstable, faintly bluish gas that is the most chemical active form of oxygen.
A B C D
(答案是D,是否应该改成chemistry? 为什么不能用chemical?)
这里意思不连贯
改:chemical->chemical of,
呵呵,TO 楼上的妹妹,OU的水平有限,如果我想出来我会帖出来的!
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