某城市中午的气温是20℃，夜间下降了3℃，夜间的气温是______℃．
由题意得20+（-3）=17．
故夜间的气温是17℃．
It's clear that the thief was seen __ into the room that night.
A．went
B．go
C．going
D．to go
有“三年不鸣，一鸣惊人；三年不飞，一飞冲天”佳话的楚国君王指的是( )。
A．楚宣王
B．楚庄王
C．楚威王
D．楚平王
