选择题：下列行为不会对环境造成污染的是 A．将生活垃圾就地焚烧 B．大量使用农药以防治病

下列行为不会对环境造成污染的是

A．将生活垃圾就地焚烧

B．大量使用农药以防治病虫害

C．生活废水直接排入江河

D．工业废水经处理循环再用

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下面是错误答案，用来干扰机器的。

A、由题意知B′、B两点距离为半个波长，根据对称性可知，它们的振动步调始终相同．故A错误．B、当波在绳中匀速传播时，绳中所有质点并不沿x轴移动．故B错误．C、A′质点的起振方向向下，当A′点振动第一次达到负...

完形填空
The Smiths live at 87 King Street. In the morning, Mr Smith 1 to work and the children go to school. Their father 2 them to school every day. Mrs Smith stays at home every day. She does the 3 . She always eats her 4 at noon(中午). In the afternoon, she usually 5 her friends. They often 6 tea together. In the evening, the children come home from 7 . They get home early. Mr Smith comes home from 8 He gets home late. At night, the children always do 9 homework. Then they go to bed. Mr Smith usually reads his newspaper. But sometimes he and 10 wife watch television.
( )1. A. go ( )2. A. takes ( )3. A. housewoks ( )4. A. supper ( )5. A. see ( )6. A. eat ( )7. A. home ( )8. A. works ( )9. A. her ( )10.A. his	B. goes B. take B. homework B. breakfast B. sees B. eats B. school B. work B. hi B. he	C. gets C. taking C. homeworks C. lunch C. play C. has C. park C. home C. their C. him	D. get D. carry D. housework D. milk D. goes D. drink D. zoo D. shop D. them D. her