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The first three of the five chapters in the book ---- very e

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The first three of the five chapters in the book ---- very easy,but the rest --- difficult.
A.is,are B.are,is C.was,were D.were,were
The first three of the five chapters in the book ---- very e
答案是B.
首先这句话的意思是:这本书的前三章很简单,但是剩下的部分很难.这是一个客观事实,所以不可能用一般过去时,因此排除C和D.
然后当我们碰到几分之几这样的情况时,要通过中心词来判断单复数.
比如说1) One third of my classmates like play tennis.
班上1/3的同学都喜欢打网球. (这句话中中心词是classmates,故看作复数)
2) Two fifth of the land has been turned into farmland.
2/5的土地变成了农场.(这句话的中心词是land,故看做单数,用了has)
同样的,The first three of the five chapters 显然是复数,用are. 而后面的 the rest 看做整体,用is.

2013-3-24 13:50看了答案之后想了很久,其实the first three并不是几分之几的问题,对不起误导了你.