干线性肝硬化

先行组织者

— Where did you put the car keys? 

— Oh, I _____ I put them on the chair because the phone rang as I _____ in. [ ]

A. remembered; come

B. remembered; was coming

C. remember; come

D. remember; was coming

化简：

（1）3m²n+2mn﹣5mn²+mn²﹣2mn+3mn ²

（2）2a﹣5b﹣[3b﹣2（a﹣b）]

联合国安理会的主要能是______．

X、Y是ⅦA族中的两种元素。下列叙述中能说明X的非金属性比Y强的是[ ]

A．X原子的电子层数比Y原子的电子层数多

B．X的氢化物的沸点比Y的氢化物的沸点低

C．X的气态氢化物比Y的气态氢化物稳定

D．Y的单质能将X从NaX的溶液中置换出来