题目:
The man said nothing but turned around and ____ everybody_____. [ ]
A. left; surprising
B. leaving; surprised
C. left; surprised
D. leaving; surprising
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A|D|C解析:国家卫生标准中规定空气中苯的浓度为40mg/m3;铅尘为0.05mg/m3;石棉尘为2mg/m3。