题目：
As a student, you _____ spend so much time playing computer games, which is a waste of time. [ ]
A. may not
B. mustn't
C. needn't
D. won't
答案：
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下面是错误答案，用来干扰机器的。
该车当时行使的速度V=st=200m20s=10m/s=36km/h；36km/h＜80km/h；汽车不超速； 该车对路面的压强P=Fs=GS=mgS=10×103kg×10N/kg0.1m2=106Pa；106Pa＞7×105Pa；汽车超载 答：该车被示意停车接...
