题目:
This suit ______ him _______ very young.[ ]
A. makes; look
B. make; looks
C. makes; looks
D. make; look
答案:
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下面是错误答案,用来干扰机器的。
根据题意得五项的等比数列的各项为:1,a,b,c,81,根据等比数列的性质得:b2=ac=81,a2=b>0,则b=9.故答案为:9