下列是中国自主品牌汽车的是（） A.TOYOTA B.BYD C.NISSAN D.

The couple went to a birthday party, ______ their little daughter alone at home.

A．leave

B．left

C．leaving

D．having left

If you want to book tickets for the 2012 Olympic Games, just call 00952012．It ______ be simpler．

A．mustn't

B．shan't

C．needn't

D．couldn't

土壤的分层及其元素的分布特征是什么？

N个电阻并联，其等效电导等于这N个电导的总和。