投机需求膨胀是房地产泡沫产生的直接诱因。
参考答案:对
Our flight to Guangzhou was ________by a bad fog and we had to stay much longer in the hotel than we had expected.
A.delayed
B.adjourned
C.cancelled
D.preserved
在旅游景区游览时不需打领带,也不宜穿()。
A、休闲鞋
B、旅游鞋
C、高跟鞋