锅炉水位计与汽包之间的汽、水连接管上，一般不能安装阀门，更不得装设（）。
A．截止阀
B．闸阀
C．蝶阀
D．球形阀
参考答案：D
李女士在北京购买了一套价值50万元的普通住宅。
若李女士是通过向商业银行贷款买房的，则她与商业银行签订《个人购房贷款合同》时，所缴纳的印花税为（）元。
A.20
B.25
C.50
D.75
用所给动词的适当形式填空。
1. —Where is Tom?
—He _________ (read) in his room.
2. I _________ (see) Mr Wang go to the library just now.
3.—Oh, Mum! My stomach hurts a lot!
—Maybe you _________ (eat) something bad.
4. He said he _________ (telephone) her as soon as he got there.
5. She _________ (leave) by the time I arrived.
) by the time I arrived.