有重要铁路通过，又有支流汇入的长江沿岸中游的重要河港城市是[ ]
A．重庆
B．武汉
C．南京
D．上海
答案：B
—Jack bought a new mobile phone the other day.
—______? That’s his third one in just one month.
A．Had he
B．Did he
C．Does he
D．Has he
高级抹灰表面平整度允许偏差（）mm.
A.2
B.3
C.4
D.5
