关于介词的There was not a breath of wind and yellow leaves fell o

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关于介词的
There was not a breath of wind and yellow leaves fell off trees _______themselves.(A)
A.of B.for C.by D.to
_______their efforts,the students can't get a mark high enough to please their parents.(D)
A.With B.Under C.In D.For
It was a small room 2.4 meters _________4.(D)
A.across B.to C.for D.by
--Is she older than you?
--Yes,she is older than I ________two years.(B)
A.to B.by C.for D.over
解释下每题的意思和选这个答案的原因.

1.选A,of oneself 意为“自动地”,by oneself意为“alone无人陪伴,独自地”.{←绝对正确!}
句意：没有一阵风,黄叶自动掉下来.
2.选D.for,表因为,是一个比较随便的表“因为”的用法.for表“因为”时,后面一般只接短语,接句子的情况一般只出现在非正式文体.其他表“因为”的还有：①because②as③since④on account of⑤because of等等.
句意：因为他们的努力,学生们没能考的一个高到让他们父母满意的成绩（有点怪）.
3.选D.by有一个意思是：(乘除法上)以...,用...(乘或除)
例如：Nine divided by three makes three.九除以三得三.
句意：它曾是一个2.4*4㎡的小房间.
4.选D.表示差距by .因为两岁是差距,表示差距用by.
句意：——她比你老?
——是的,她比我老2岁.
以上经吾师严密鉴定.

关于介词的There was not a breath of wind and yellow leaves fell o there wasn't a breath of wind the wind was blowing harder and harder,and two leaves fell d 哪里有下wind a breath of heart的主题曲wind这首歌啊? the wind sent the fallen leaves------here and there There are green ,( ) green and light yellow leaves. there'll be a stong wind ________the south of the yellow riv Wind·a breath of heart这部新海城的什么作品啊中文名 in autumn,the（）are yellow and brown. a.leaves the plant（）small ,yellow and brown.a.leaves [ ]autumn,leaves [ ] yellow and fall . 1."There was not a single trail,no sign of civilization,and