在高温下,反应2HBr(g)H2(g)+Br2(g)(正反应为吸热反应)达到平衡时,要使混合物气体的颜色加深,可采用的反应条件是( )
﹣﹣﹣How do you usually go to school?
﹣﹣﹣I to school on foot.( )
A.goB.wentC.was goingD.will go
﹣﹣﹣ I hand in the report today?
﹣﹣﹣No,you needn't.( )
A.CanB.MustC.ShallD.Could
The hotel is very old.It's one of buildings in the city.( )
A.oldB.olderC.oldestD.the oldest
﹣﹣﹣ did you stop playing?
﹣﹣﹣Because I was tired.( )
A.HowB.WhyC.WhenD.Where
More and more young people go skating winter.( )
A.atB.inC.onD.to