生活中的下列变化，没有发生化学变化的是（ ）
A．定向爆破
B．葡萄酿酒
C．湖水静置沉降
D．食醋除水垢
C．
题目分析：A、定向爆破过程中使用火药，火药爆炸能生成二氧化碳等物质，属于化学变化．B、葡萄酿酒的过程中有新物质﹣﹣酒精生成，属于化学变化．C、湖水静置沉降过程中，只是不溶于水的物质沉到湖底，过程中没有新物质生成，属于物理变化．D、食醋除水垢时，食醋中的醋酸和水垢中的碳酸钙、氢氧化镁反应，能生成醋酸钙、水、二氧化碳、醋酸镁等物质，属于化学变化
| 阅读理解。 |
| Mrs.Brown is English. She is from Manchester. Manchester is a city in the north of England. Now she works in London. She teaches English in a middle school and her students are between 12 and 16 years old. She can speak English and French. She has two children. Her son is 15 years old, and her daughter is 12 years old. She likes to watch movies and sing songs. |
| 1. Mrs. Brown is . |
[ ] |
| A. French B. English C. Chinese D. Canadian |
| 2. Mrs.Brown can speak . |
[ ] |
A. one language (语言) |
| 3. Mrs.Brown comes from ______. |
[ ] |
| A. London B. Manchester C. New York D. Ottawa |
| 4. Mrs.Brown has ______. |
[ ] |
| A. one son and two daughters B. two sons and two daughters C. two sons D. one son and one daughter |
| 5. Mrs.Brown likes ______. |
[ ] |
| A. watching Tv and listening to the radio. B. watching movies and playing on the computer C. listening to the radio and singing song. D. watching movies and singing songs. |