问题
操作题
如图所示，一束光射到两个相互垂直的平面镜上，请画出经两个平面镜反射的光路图．
答案
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如图所示，一束光射到两个相互垂直的平面镜上，请画出经两个平面镜反射的光路图．
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| In America, when people say "man's best friend", they don't mean 1 person. Instead they are talking about a lovely animal: a dog! These words show the friendship between people and 2 . Dogs and other pets can give 3 to people's lives. Some people think of their pets as their children. A few even leave all their money to their 4 when they die! Animals can help people, too. Dogs can be taught to become the " 5 "for a blind (瞎的) person or " 6 "for a deaf (聋的) person. Scientists have found that pets help people live 7 ! They make people happier, too. Because of that animals are brought into hospitals for "visits". Americans hold "Be 8 to Animals Week", the first week of May. Pet shows are held during the week. Even if you don't live in America, you, too, can do this. How? If you have a pet, take 9 time this week to play with it. Remember to give it delicious 10 . If you don't have a pet, be kind to animals around you. If you see a 11 dog, don't kick it or throw things at it. Instead, just leave it alone, or better yet, make friends with it. If others around you do bad things to an animal, try to 12 them. As people, we must protect animals who can't speak for themselves. |
| ( )1. A. another ( )2. A. persons ( )3. A. sadness ( )4. A. family ( )5. A. eyes ( )6. A. eyes ( )7. A. alone ( )8. A. Bad ( )9. A. less ( )10. A. food ( )11. A. lovely ( )12. A. help | B. the other B. people B. sad B. pets B. ears B. ears B. together B. Happy B. more B. meat B. little B. catch | C. other C. plants C. happiness C. children C. hands C. hands C. shorter C. Nice C. no C. drink C. street C. beat | D. others D. animals D. happy D. parents D. feet D. feet D. longer D. Sad D. some D. milk D. home D. stop |