中国联通全国客户服务中心提出完成目标的（），并组织省公司落实。
A.方式
B.方法
C.手段
D.步骤
E.通报
参考答案：A, B, C, D
Noise pollution was a serious problem here . [ ]
A. in the past
B. in the future
C. since then
D. once a week
_____ U2, the Irish rock band from Dublin perform a concert in Beijing, tell me in advance.
A．If
B．Shall
C．Should
D．Would
