问题 单项选择题

空气中的甲醛与酚试剂反应生成嗪,嗪在酸性溶液中在高铁离子氧化作用下形成()化合物。

A、酸性

B、中性

C、碱性

D、有机溶液

答案

参考答案:A

阅读理解

根据短文内容,选择正确答案。

     We have twenty minutes' rest between classes. Look! Most of us are playing during the break time.

  Some students are on the playground. They are playing basketball. Oh! A boy is running with the ball.

 And another is trying to stop him. They look so cool. And there are some girls watching the game. Some

 students are in the classroom, They are talking. A few of them are reading and doing homework. Look!

  A girl is looking at the birds in the tree in front of the classroom. She must be thinking of something

 interesting because she is smiling (微笑) .

     What are the teachers doing? Some of them are working in the office. And some are talking with

 students. Everyone is doing his or her things, busy but happy !

l. Where are the students playing basketball?

    A. In front of the tree.

    B.  In front of the classroom.

    C. On the playground.

    D. In the tree.

2.  A girl is looking at the birds.  She is _____.    

     A. happy

     B. cool

     C. interesting

     D. exciting

3. What are the teachers doing?

    A. Working or talking with students.

    B. Having a basketball game.

    C. Playing with the students.

    D. Looking at the birds.

4. There are _____ students in the classroom.

    A. no          

    B. some

    C. few        

    D. many

5. The passage is mainly(主要) about _____.

    A. students

    B. a basketball game

    C. break time activities

    D. teachers

单项选择题