关于我国三家期货交易所结算制度说法，正确的是（）。

A.采取分级结算制度

B.区分结算会员与非结算会员

C.交易所会员既是交易会员也是结算会员

D.设立独立的结算机构

用代词的适当形式填空

小题1:These books are ____ (she).

小题2:___name is Li Lei. (he)

小题3:Thank ___ very much. (you)

小题4:He is in ____room. (us)

小题5:Are ____ Chinese? (he)

小题6:How old is ___? (her)

小题7:Excuse ____.(I) May I use your ruler?

小题8:This is ____ classroom. (we)

小题9:Can ____ spell it, please? (you)