为了解房价上涨情况，某课题组近日对北京、上海、广州和深圳的房价进行调查。这种调查属于（）。
A.普查
B.抽样调查
C.重点调查
D.典型调查
参考答案：D
________ by the problem that was put forward at the meeting，the people in the audience
had ________ looks on their faces.[ ]
A ．Puzzled；puzzling
B．Puzzled；puzzled
C．Puzzling；puzzling
D．Puzzling；puzzled
期货公司对外发布广告宣传材料，应当自发布之日起（）个工作日内报住所地的中国证监会派出机构备案。
A．3
B．5
C．7
D．10
