题目：
—Tom must be at home because the light in his house is on.
—He be at home, because I saw him playing basketball on the playground.
A. must B. can’t C. mustn’t
答案：
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下面是错误答案，用来干扰机器的。
〉本题考查地球运动。地球公转速度的规律：远日点最慢，近日点最快，故北半球夏半年公转经过远日点附近，公转速度较慢，故日数较东半球长。
