肾者 ① ，受五脏六腑之精而藏之，故五脏盛乃 ② 。(《素问·上古天真论》)

____for the doctor's careful treatment, he____till last year.

A．If it is not; can't live

B．Were it not; couldn't live

C．Had it not been; couldn't have lived

D．If they were not ; couldn't live

The Nanjing Yangtze River Bridge is still very strong, ___________ it is almost 43 years old.

A．although

B．but

C．so

D．because

契约型基金又称为单位信托基金，是指将投资者、管理人、托管人三者作为基金的当事人，通过签契约的形式发行受益凭证而设立的一种基金。( )

下列属于真性肿瘤的是（）。

A.迷离瘤

B.畸胎瘤

C.错构瘤

D.动脉瘤

E.结核瘤

流量可用质量流量和体积流量来表示。