argument争论，论据，论点
target靶子，目标
stimulus刺激物 (pl. stimuli)
7. The river widens considerably as it begins to turn west.
A. extends B. stretches C. broadens D. bends
比较：
The river widens considerably as it begins to turn west.
A. extends B. stretches C. broadens D. traverses
分析： 答案都是broadens.
widen – broaden变宽
considerable – large 相当(大、多)的，很多的
extend -- stretch伸展，伸出
bend弄弯，使弯曲
8. Many economists have given in to the fatal lure of mathematics.
A. error B. puzzle C. attraction D. contradiction
比较：
Many economists have given in to the fatal lure of mathematics.
A. error B. function C. attraction D. miracle
分析： 答案都是attraction.
fatal – killing -deadly 致命的
lure – attraction – temptation诱惑
error – mistake错误
puzzle难题，迷惑
contradiction矛盾，抵触，相反
miracle –wonder 奇迹
9. A great deal has been done to remedy the situation.
A. maintain B. improve C. preserve D. protect
比较：
Hundreds of years ago cloves丁香were used to remedy headaches.
A. disrupt 使分裂 B. diagnose C. evaporate D. cure
分析： 分别考察动词remedy的两个常用词义。
A great deal 大量的(事情， 工作等)
maintain -- preserve – protect保护，维护。
diagnose 诊断(疾病)。
cure -- treat 治疗