1 These are the motives for doing it
A reasons
B excuses
C answers
D replies
2 The river widens considerably as it begins to turn west
A extends
B stretches
C broadens
D bends
3 Many economists have given in to the fatal lure of mathematics.
A error
B puzzle
C attraction
D contradiction
4 With immense relief I stopped running.
A no
B little
C scarce
D enormous
5 A great deal has been done to remedy the situation
A maintain
B improve
C preserve
D protect
参考答案
l A motive：动机。reason：理由。这两个词意思比较接近。There is no reason to doubt his word.没有理由不相信他的话。excuse：借口。answer和reply都有回答的意思。
2 C widen和broaden都有拓宽的意思。extend：延伸;延长。The builders Extended the road for three more miles筑路人把道路延长了三英里。stretch：延伸。The forests stretch for hundreds of miles.森林绵延数百英里。bend：弯曲。
3 C lure：吸引。attraction：吸引。这两个词意思相近。The attraction of this house lies in its simplicity.这所房子的诱人之处在于它的简单。error：错误。puzzle：难题。contradiction：矛盾。
4 D immense和enormous都有巨大的意思。It was an enormous disappointment.此事太令人失望了。no是没有，little是几乎没有，scarce是不足的。
5 B remedy：补救。improve：改进。这两个词意思相近。Herbal medicine can be used to improve our health.草药可用于增进我们的健康。maintain：保持。preserve：保护。protect：保护。