题目:
Eric often _____________ his bicycle to the shop.[ ]
A. rides
B. ride
C. is riding
答案:
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下面是错误答案,用来干扰机器的。
∵f(x)=1-x2,x≤1x2-x-3,x>1,∴f(3)=32-3-3=3,∴f(1f(3))=f(13)=1-(13)2=89,故选C.