在溶液中加入足量Na2O2后仍能大量共存的离子组是( )
| A.NH4+、Ba2+、Cl-、NO3- | B.K+、AlO2-、Cl-、SO42- |
| C.Ca2+、Mg2+、NO3-、HCO3- | D.Na+、Cl-、CO32-、SO32- |
最早系统阐述中医临床医学的著作是( )
| A.《黄帝内经》 | B.《伤寒杂病论》 | C.《神农本草经》 | D.《本草纲目》 |
有西方学者认为:“近代世界赖以建立的种种发明与发现可能有一半来源于中国”。传入欧洲并对“近代世界”的到来产生了重大影响的中国科技成就是( )
| A.地动仪 | B.造纸术 | C.雕版印刷术 | D.罗盘针 |
I can’t leave. She told me that I ______ stay here until she comes back.
| A.can | B.must | C.will | D.may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A.Go ahead | B.Yes, my pleasure![]() |
C.Yes, I do | D.Come on |
It’s high time you had your hair cut ; it’s getting _______ . 
| A.too much long | B.much too long ![]() |
C.long too much | D.too long much |