开展共建活动，一般情况下，由（）单位组织实施。
A、师级
B、团级
C、营级
D、连级
参考答案：D
—— Few children are as bright as he is, and also, he works very hard.
—— It’s no ＿＿＿＿＿ that he always gets the first place in any examination.
A．question
B．doubt
C．problem
D．wonder
工程资源管理器窗口中包含的文件类型有( )种。
A．2
B．3
C．4
D．5
