阅读下面的短文，掌握其大意，然后从下列各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题纸上将该项涂黑。
Animals perform many useful and amusing jobs. Dogs are particularly valuable in guiding the blind, 31 property(财产), finding 32 people, and hunting criminals(犯人). Horses are used in guarding herds(牧群)，carrying men in lands where there are no roads, and helping farmers work their land. Pigeons(鸽子) 33 to carry messages. Wild animals from the jungles, forests and seas are very popular performers in 34 and motion pictures(电影). People realize that, 35 animals may not have the same intelligence(智慧) as 36 , they are clever enough to learn certain things.
The first thing a dog is taught is to 37 . It should not 38 too 1ong for him to learn commands. Simple orders, such as “sit, lie down，stay there, come here, ” can 39 be taught by a child.
Training a dog to be a watchdog often produces unexpected results. Some dogs quickly learn the difference 40 unwanted people and friends. This is 41 their masters welcome friends and invite them into their houses. However, some dogs will always 42 the postman who comes to 43 letters. One explanation for this behavior is that, although the postman comes to the house often, he never 44 the house. Therefore, the dog thinks the postman is someone 45 is not wanted, but keeps 46 back anyway.
Dogs are extremely useful as 47 for blind people. When a dog has been properly trained, he will lead his blind master in the right direction and keep him 48 danger. For example, seeing eye dogs 49 a busy road when cars are coming, 50 their masters command(命令) them to do so.
1. A. saving B. helping C. making D. protecting
2. A. lost B. losing C. loss D. missed
3. A. have long used B. have long been used
C. have long been using D. are long being used
4. A. cinemas B. theatres C. museums D. circuses(马戏团)
5. A. although B. as C. since D. because
6. A. children B. human being C. human beings D. students
7. A. obey B. order C. do D. study
8. A. spend B. take C. use D. want
9. A. still B. though C. enough D. even
10. A. from B. between C. among D. with
11. A. because of B. due to C. why D. because
12.A. beat B. protest C. attack D. eat
13. A. deliver B. give C. post D. fetch
14. A. enters B. enters into C. gets D. arrives to
15. A. he B. who C. whom D. which
16. A. come B. to come C. from coming D. coming
17. A. companies B. companions(同伴) C. men D. colleagues(同事)
18. A. out from B. out C. out of D. out by
19. A. learn never to across B. learn to never cross
C. never learn to cross D. learn never to cross
20. A. even B. if C. even if D. because
---How about putting some pictures into the report?
---________ A picture is worth a thousand words.
A. I don’t think so. B. Why not? C. Thank you. D. It doesn’t matter.
One minute she burst into ________ and the next burst out ________. We just couldn’t catch her mood at any moment.
A. crying; laughter B. tears; laughter C. tears; laughing D. crying; laughing
We all agree that the products of this factory are of better ________.
A. quality B. quantity C. principal D. identity
I want to buy that kind of cloth because I ________ the cloth washes well.
A. have told B. have been told C. have been telling D. told
In the dark street, there wasn’t a single person, _______ she could turn for help.
A. that B who C. from whom D. to whom
