20℃时，在100 g水中溶解11.1 g K2SO4恰好达到饱和，此饱和溶液的

Many old buildings _____ in order to build the EXPO garden. [ ]

A. were put down

B. pulled down

C. were pulled down

D. put down

I go to the cinema a lot. I often go alone, b      小题1:sometimes my friend Rose comes, too. My husband n      小题2:comes with me because he is always too busy! I buy chocolates to e     小题3:  during the film. I usually e      小题4: these night films very much. I don't want to see the s   小题5: film twice, but sometimes I do if it's really good.

在人体内含量最少，对维持人体正常的生理活动有重要作用的物质是          。人体内主要的供能物质是           。在人体内含量最多，并参与各种生理活动的物质是           。

女性，44岁，反复发作上腹部疼痛3年，近3天上腹绞痛，伴发热寒颤，皮肤巩膜黄染。

该病最可能的原因是( )。

A．肿瘤

B．结石

C．蛔虫

D．炎性狭窄

E．先天畸形

起重机械主要采用的是机械传动，根据起重量的大小采用开式传动和（）两种。