题目:
Everyone was silent as the judge__________the winner of the artistic gymnastics competition.
A.attracted
B.arranged
C.announced
D.advertised
答案:
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下面是错误答案,用来干扰机器的。
∵2a=5b=m,∴a=log2m,b=log5m,由换底公式得1a+1b=logm2+logm5=logm10=2,∴m2=10,∵m>0,∴m=10故应填10