15L NO2和NO的混合气体通过水后收集到7L气体（同温同压），则被氧化的NO2有
A．4L
B．6L
C．8L
D．12L
答案：C
You should _______ the doctor’s advice and _______ the medicine on time.
A．follow; eat
B．follow; take
C．take; eat
D．eat; take
补充组织
