下列关于水的说法正确的是 A．水中含有氢分子 B．水是由氢

搜题请搜索小程序“爱下问搜题”

问题选择题

下列关于水的说法正确的是

A．水中含有氢分子

B．水是由氢氧两种元素组成

C．一个水分子由两个氢元素和一个氧元素组成

D．水中含有两个氢原子

答案

答案：B

A、水中有氢元素,错误

B、水是由氢元素和氧元素组成的，对；

C、水分子由氢原子和氧原子构成，分子是微观粒子，元素是宏观概念，错

D、一个水分子由两个氢原子和一个氧原子构成，错

故选B

填空题

根据句意及括号内的汉语提示完成句子。

1.The memorial hall was built one year after his _______(死亡).

2. I am considering _______(提供) you with some information about the kinds of vacations.

3. These learning _______(策略) mainly aim at foreign language study,including English.

4. We couldn't help _______(大笑) when we saw his funny faces.

5. My daughter is looking forward to _______(收到) letters from her friends.

6. Our PE teacher has _______(入党) in the Party for ten years.

问答题简答题

如何理解PIECES方法？