问题
选择题
以下说法正确的是： [ ]
A、分子和原子最大的区别是分子能保持物质的化学性质，而原子不能
B、含氧元素的化合物就是氧化物
C、由一种元素组成的物质就是单质。
D、虽然稀有气体元素的原子具有稳定结构，但在一定条件下，它们也会发生化学变化。
答案
答案：D
搜题请搜索小程序“爱下问搜题”
以下说法正确的是： [ ]
A、分子和原子最大的区别是分子能保持物质的化学性质，而原子不能
B、含氧元素的化合物就是氧化物
C、由一种元素组成的物质就是单质。
D、虽然稀有气体元素的原子具有稳定结构，但在一定条件下，它们也会发生化学变化。
答案：D
| 阅读理解。 | ||||
| ||||
| 1. What's the subject of this e-mail? | ||||
| A. Books on sale. B. Invitation to a party. C. Going shopping | ||||
| 2. Li Fang will buy some books _____. | ||||
| A. after the English exam B. before the English exam C. after the physics exam | ||||
| 3. What's Wang Le's favorite subject? | ||||
| A. History. B. Computer. C. Science | ||||
| 4. Will Wang Le go to the bookstore with Li Fang? | ||||
| A. We don't know. B. Yes, he likes it. C. No, I don't think so. | ||||
| 5. From the passage we know _____. | ||||
| A. they are friends B. they are strangers C. they are mother and son |
