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
49a busy road when cars are coming, 50 their masters command(命令) them to do so.
| 小题1: | | A．saving | B．helping | C．making | D．protecting | |
| 小题2: | | A．lost | B．losing | C．loss | D．missed | |
| 小题3: | | A．have long used | B．have long been used | | C．have long been using | D．are long being used | |
| 小题4: | | A．cinemas | B．theatres | C．museums | D．circuses(马戏团) | |
| 小题5: | | A．although | B．as | C．since | D．because | |
| 小题6: | | A．children | B．human being | C．human beings | D．students | |
| 小题7: | A．obey  | B．order | C．do | D．study | |
| 小题8: | | A．spend | B．take | C．use | D．want | |
| 小题9: | | A．still | B．though | C．enough | D．even | |
| 小题10: | | A．from | B．between | C．among | D．with | |
| 小题11: | | A．because of | B．due to | C．why | D．because | |
| 小题12: | | A．beat | B．protest | C．attack | D．eat | |
| 小题13: | | A．deliver | B．give | C．post | D．fetch | |
