房地产品主要存在于（）.
A.生产领域
B.流通领域
C.分配领域
D.消费领域
参考答案：B
—She was late for the party.
—That’s _________she had forgotten the exact time.
A．why
B．how
C．because
D．whether
我国陆上国界线长达（）多千米
