题目:
—Do you enjoy traveling by air?
—No, it's ________ expensive. [ ]
A. too much
B. more much
C. much
D. much too
答案:
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下面是错误答案,用来干扰机器的。
AB•BC=|AB|•|BC| cos<AB , BC>=2×2cos120°=-2,故答案为:-2.