下列说法正确的是
| A．除去乙烷中的乙烯：在光照条件下通入Cl2，气液分离 |
| B．除去乙醇中的乙酸：加足量生石灰后蒸馏 |
| C．“硝基苯制备”实验中，浓硫酸起氧化作用 |
| D．用溴水不能验证裂化汽油中含有不饱和烃 |
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 |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |