进行租房或购房的选择决策时,下列因素变动会增加购房可能性的是()。
A.利率水平提高
B.预期房价上升
C.规定首付比例提高
D.租房押金及租金水平降低
参考答案:B
简述肿瘤的发病原因。
They had no sooner arrived at the airport ________ it was time to check in.[ ]
A. when
B. before
C. than
D. though