在具备施工条件的前提下，发包人不按约定预付工程款，承包人应在预付时间到期后（ ）天内

---- Is _____ manager and _____ engineer to attend the meeting this afternoon?

---- I have no idea.

A．a; a

B．the; /

C．the; the

D．a; the

The comments on the film, ______ this is one example, are very sharp.

A．of what

B．for that

C．of which

D．for which

紫外线可引起哪一种肿瘤（）

A.皮肤癌

B.肺癌

C.膀胱癌

D.白血病

E.胰头癌

简述中国气候特征。

患儿，男，6岁，双侧隐睾症的最好治疗方案为

A．等待自发下降
B．先给予绒毛膜促性腺激素治疗，无效时等到青春期前手术治疗
C．绒毛膜促性腺激素治疗
D．先试用LHRH治疗，无效则做睾丸松解固定术
E．睾丸酮治疗