经实验测定，某物质含有一种元素，下列推断正确的是[ ] A．

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问题选择题

经实验测定，某物质含有一种元素，下列推断正确的是 [ ]

A．该物质一定是纯净物

B．该物质一定是单质

C．该物质一定是混合物

D．该物质一定不是化合物

答案

答案：D

填空题

在句子中适当的地方填入all或both。

1、My parents are engineers.

2、Mr and Mrs Zhang are twenty-five years old.

3、The students in Mr Wang's class are good at Chinese.

4、You and Wang like chocolates, don't you ?

5、The people in this city like music.

6、The teachers of No. 10 Middle School are good.

7、Tom and Linlin play basketball well.

8、Tony and Helen are my cousins.

9、Your grandparents love you very much.

10、Han Meimei, Tommy and Jack jump high.

判断题

正常情况下，用户的ARPU值一般变化不大，多数ARPU值的变化由价格导致。（）