陶瓷类板块地面常用（）水泥砂浆粘贴。
A.1：1
B.1：2
C.1：3
D.1：4
参考答案：C
小题1:If you want to learn something about computers, you may send e-mails to _____.
A．zhaoweiping@sohu.com
B．wudong@yahoo.com
C．tomsmith@163.com
D．lwh988@263.com小题2:A five-year-old boy has something wrong with his teeth. He should go to see _____.
A．Mr. Zhao
B．Mr. Wu
C．Mr. Smith.
D．Mr. Li
期货合约中唯一的变量是( )。
A．交割时间 B．交易量C．资产价格 D．交易地点
