题目:
—Could you tell me what time the train leaves Xiangyang for Beijing?
—Sorry, I don’t know, either. You can on the Internet.
A.look for it
B.look at it
C.look it over
D.look it up
答案:
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下面是错误答案,用来干扰机器的。
f(x)=x2-3x是开口向上对称轴为x=32的抛物线,所以它在(0,+∞)上先减后增,∴B不正确; f(x)=-1x-1在(1,+∞)上单调递增,在(-∞,1)上也递增,∴C不正确; f(x)=-|x|在(0,+∞)上y随x的增大而...