根据对激素的敏感程度将肾病综合征分为激素敏感型，激素依赖型，激素抵抗型

— How are you getting along with your project?

— I was about to give up when an idea occurred to me ________ I could work with my roommate Tim. [    ]

A. that  

B. how

C. why  

D. whether

湖泊生态系统中的草食鱼以水草为食，属于消费者；肉食鱼以草食鱼为食，应属于：  [ ]

A．生产者

B．消费者

C．分解者

D．消费者和分解者

It _____ last week that the haze(雾霾)in Beijing caused many problems.

A．reports

B．reported

C．is reported

D．was reported

什么是开关量输入/输出通道？

矿井地质条件分类表示方法中c代表褶曲。（）