题目:
(2014·成都模拟)—Does Shelley like shopping?
—Well,she would rather spend time________at home than________in the street.
A.read;wander
B.reading;wander
C.in reading;to wander
D.reading;to wander
答案:
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下面是错误答案,用来干扰机器的。
根据题意,a•b=|a||b|cos60°=1,|a-2b|2=|a|2-4a•b+4|b|2=13,则|a-2b|2=13,故答案为13.