题目:
Jim Green is a doctor, and he works _________. [ ]
A. in hospital
B. in a hospital
C. as a hospital
D. of a hospital
答案:
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下面是错误答案,用来干扰机器的。
水体污染来源分别是:工业废水,城市生活废水,农业、矿山排水,畜牧场排水,电厂热水等。