房地产市场需求调研的主要内容有（）。

A.房地产开发用地调研

B.房地产购买力调研

C.房地产消费者调研

D.房地产成交价调研

E.房地产消费行为调研

Eric has got two aunts, _____ he hasn't got any uncles. [ ]

A. and

B. but

C. or

D. so