A:碳+氧气 →点燃 二氧化碳
B:氧化汞 →加热 汞+氧气
C:乙醇+氧气 →点燃 二氧化碳+水
D:一氧化碳+氧气 →点燃 二氧化碳
When a driver sees the sign "STOP", he ______ stop. He ______ go on.
下列山脉中属于我国季风区与非季风区界线的一组是( )
① ____ A.flower B.snow C.now D.down
② ____ A.bear B.chair C.pair D.fear
③ ____ A. children B.school C.cheap D.peach
④ ____ A.cloud B.about C.count D.you
⑤____ A.climb B.bad C.club D.subway
He __________ a shower and then goes to bed.