* * 毛滴虫适宜的生长环境为A．pH＜5 B．pH5.5～6.0 C．pH6.0～6.

阅读下面的短文，选择正确的答案。

      Hi, I'm Wu Yifan. I'm going to have a busy weekend! On Saturday, my father is going to buy some

newspapers. My mother is going shopping. I'm going to visit my friend, Mike. On Sunday, my father is going

to read a magazine. My mother is going to watch TV. I'm going to the bookstore. I'm going to buy a dictionary.

After that we are going to the cinema.

1. — What is Wu Yifan's father going to buy on Saturday?  — He is going to buy some ____________.

A. newspapers

B. magazines

C. comic books

2. — Where is Wu Yifan going on Sunday?  — He is going to the ____________.

A. supermarket

B. bookstore

C. library

3. — After that where are they going?  — After that they're going to the ____________.

A. post office

B. museum

C. cinema

公务员行为规范的内容不包括协调友邻。（）

投标保证金的形式一般有( )。

A．银行保函

B．可撤销的信用证

C．保兑支票

D．转账支票或现金支票

E．银行汇票

左心室增大可见于（）

A.二尖瓣狭窄

B.二尖瓣关闭不全

C.房间隔缺损

D.法洛四联征

E.Ebstein畸形

直接用天然气置换管道内的（）容易使管道产生内爆

A.氮气

B.天然气与空气的混合物

C.空气

D.B、C都正确