大气环境现状调查不包括的内容是( )。
A．大气污染源调查
B．污染气象调查
C．大气污染物调查
D．大气环境质量现状调查
参考答案：C
我们可以模拟地球生物圈的条件，建造供人类居住的生物圈Ⅱ号。[ ]
—What were you doing at this time yesterday?
—I ______ on the grass and playing with Tony.
A．sit
B．sat
C．am sitting
D．was sitting
