To tell _____ truth, it is ______ strugg

They were        at the         child, for he was so addicted to the Internet that he stayed up till 12o’clock every night.

A．disappointed;disappointed.

B．disappointing;disappointing.

C．disappointed;disappointing.

D．disappointing;disappointed.

I’m _______ the Drawing Club. What about you?

A．the member

B．the member of

C．a member of

D．a member

下表是某人的原尿和尿液样品中主要物质的浓度（克／100毫升）比较表。

据表分析：______样品为尿液，主要原因是该样品____________的含量为0，而___________含量高。尿的形成是通过肾小球的__________作用和肾小管的____________作用完成的。

对于试买率低，再买率高的产品企业应采取的策略是重新设计或放弃生产。（）

急性肾衰竭透析治疗的目的是（）

A.有助于液体、热量、蛋白质及其他营养物质的摄入

B.纠正高钾血症和代谢性酸中毒

C.尽早清除体内过多的水分、毒素

D.恢复正常的肾功能

E.有利于肾损伤细胞的修复和再生