Did the writer’s brother know the birthday boy? Who invited the writer’s brother?My brother didn’t know the birthday boy , but the boy’s ____had invited him.
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Did the birthday boy know the writer’s brother? How do you know?No, he didn’t. Because he pointed ____at my brother and ____,“Who is he”.
下面哪些污染物不是分子态污染物( )
A. TSP
B. NOX
CO
D. H2S
空气执行的质量标准只有一个GB3095《环境空气质量标准》。( )
A. 对
B. 错
空气中的臭氧既包括一次污染物,也包括二次污染物。( )
A. 对
B. 错