根据下列装置回答．

①仪器a的名称是____ ；

②实验室用氯酸钾和二氧化锰的混合物制取氧气，可选择的一组装置是____ 　（填编号），写出反应的化学方程式　____ ；

③用大理石和稀盐酸制取二氧化碳，反应的化学方程式是____ ．符合启普发生器原理的装置是　____ （填编号）；

④图G是收集M气体的实验装置，据此可推测出M具有的性质为____ （填字母序号）．

A．M气体的密度大于空气的密度    B．M气体的密度小于空气的密度

C．M气体溶于水所得溶液呈酸性    D．M气体溶于水所得溶液呈碱性．

A:Maria,____?

B:I think a good friend is good at sports.

A:You mean he or she is athletic?

B:Yes.And ____.He or she often makes me laugh.

A:Anything else?

B:Er,I think____ .

A:I can't agree with you. I like to have friends____.

B:Do you think a good friend should be popular in school, too?

A:Well,____.

A. who are different from me

B. how are you

C. a good friend likes to do the same things as me

D. that's not very important for me

E. what is a good friend like

F. you are right

G. he or she is funny

宏伟的事业需要宏大的目标作引领，到新中国成立一百年时，我们的目标是：人均国内生产总值达到中等发达国家水平，建成       的社会主义现代化国家。（    ）