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【单选题】
将装有 50 mL NO 2 、 NO 混合气体的量筒倒立于水槽中,反应后气体体积缩小为 30 mL ,则原混合气体中 NO 2 和 NO 的体积比是 ( ) A . 5 ∶ 3 B . 3 ∶ 5 C . 3 ∶ 2 D . 2 ∶ 3A.
B.
C.
D.
D
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【简答题】In my ( 意见,看法 ) , it is good for us to play sport.
【简答题】play sport
【简答题】（ ）是整个应急救援系统的重心，主要负责协调事故应急救援期间各个机构的运作，统筹安排整个应急救援行动，为现场应急救援提供各种信息支持等。
【单选题】The girl _____ every Sunday. [ ]
A.
play sport
B.
plays sport
C.
play sports
D.
plays sports
【简答题】It is learnt from the experiences that kids get much more than just keeping fit when they play sports. Many people think that sports will waste time, and kids will not concentrate on their studies. 小题...
【简答题】a noun that can also be used to talk about the way actors act and sportspeople play sport. ____________
【单选题】When you play sport,you need to guard________accidents.
A.
over
B.
against
C.
with
D.
at
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