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英语四级

单选题

A．To climb hills．
B．To gain traction．
C．To fool its enemies．
D．To rest as it moves．

Why does the side—winder move the way it does?
【解题思路】四项均为以to开头的不定式短语，而不定式短语通常可以表示目的。因此本题很可能考查某种做法的目的是什么。
【解析】题干问这种斜行蛇为什么要这样移动。短文中提到： “With nothing firm to push against for fraction．the side-winder has had to adapt its way of movement to the shifting sand．(由于找不到坚硬的东西来提供支撑摩擦力，斜行蛇只能使其移动的方式适应松软的细沙环境。.”接着，讲话者将这种蛇的移动方式与滑雪者的行进路线进行了类比，故选B。

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3Questions are based on the following passage．
The secret to happiness is keeping busy，research has found．Keeping the mind 26 with tasks—no matter how meaningless—staves off(赶走.negative emotions，the study found．
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had stayed 29．
Prof Hsee 30 keeping busy helped keep people happy．He said the findings，reported in the journal Psychological Science，had policy 31．“Governments may increase the happiness of idle citizens by having them build bridges that are 32 useless，”he proposed．At the individual level，he advised，“Get up and do
something．Anything．Even if there really is no point to what you ale doing，you will feel better for it”He 33，“Incidentally，thinking deeply or engaging in self-reflection 34 as keeping busy，too．You do not need to be running around—you just need to be 35，either physically or mentally．”
A.study
B.added
C.thought
D.option
E.engaged
F.especially
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