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【单选题】
函数f(x)=X2–4x+3 ( )A.
在（-∞，2）内是减函数
B.
在（–∞，4）内是减函数
C.
在（–∞，0）内是减函数
D.
在（–∞，+∞）内是减函数
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【单选题】7
A.
He enjoys working in the advertising company.
B.
The job requires beginners to work hard.
C.
His well-paid job requires a lot of hard work.
D.
He feels underpaid for he often works overtime.
【简答题】A. The job requires beginners to work hard. B. He enjoys working in the advertising company C. His well paid job requires a lot of hard work. D. He feels underpaid for he often works overtimes.
【单选题】听力原文： Up to now, we have focused on the positive impact of the automobile on society in the United States. Today we'll look at some of the negative effects. A number of sociologists blame the automobi...
A.
It allowed workers to spend more time at home.
B.
It gave workers opportunity for better training.
C.
It enabled people to live far from their workplace.
D.
It eliminated many factory jobs.
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