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1.____ the text a second time,the meaning will become cleare

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1.____ the text a second time,the meaning will become clearer to you.
A.Read B.Reading C.When you read D.If reading
2.Ocean currents affect the climates of the lands ____ they flow.
A.on which B.near which C.out of which D.from which
3.At the beginning of class,the noise of desks ____ could be heard outside the classroom.
A.opened and closed B.to be opened and closed
C.being opened and closed D.to open and close
第一题选c.这是用When 引导的时间状语从句.选项A.Read 是一个祈使句,那么主句的主语应该是you,因为祈使句的隐含主语是you.而本题的主句主语却是meaning .选项 B.Reading D.If reading都是用doing的形式,说明动词与主句主语的关系是主动,也就是说主句的主语应是人,很明显meaning 不是.
第二题选b.这是一个定语从句,你可以把先行词代到从句中去既是they flow near the lands.这里用which代替 land,并把near which 放到从句句首来引导.其他的选项中文意思不对.
第三题选c.这里首先把B.to be opened and closed D.to open and close
排除,因为动词不定式有表示将要做的事情不符合本题题意.在ac当中选.根据句意当时一定是正在开关课桌,所以选c.