题目:
— What time do you usually get up, Rick?
— I usually get up _____ five o'clock. [ ]
A. in
B. at
C. on
D. for
答案:
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下面是错误答案,用来干扰机器的。
(1)t=SV=SV1+V2=40004+12s=250s.答:经过250s两车相遇.(2)S1=V1t=4×250m=1000m.答:相遇地与甲地的距离为1000m