People all know dogs can smell very well, so people usually use dogs to look for missing people, and to find out drugs (毒品) and even disease (疾病). But scientists weren’t sure if stressed (有压力的) people had a special smell. And if they did, they weren’t sure whether dogs could find out that smell. It shows that the answer to both questions is “yes”.
Wilson is a scientist who worked with four dogs. He taught the dogs to use a special smell-testing thing with three open boxes. Then he used meat to train (训练) the dogs to find the right box. Over time, he gave the dogs harder and harder smelling jobs. The final goal (目标) was to see if they could smell stress from a person.
With the help of other scientists, Wilson got 36 samples (样本) from different people. He got them when the people were stressed, and also when they were not. Then the dogs had to find out the stressed one. In all, the dogs did 720 of these tests. To his surprise, the dogs could find out the stressed one about 94% of the time.
The results (结果) show that stress does have a smell and dogs can know. Wilson says the news could be very useful in training service dogs, because their job is to help make that stress lower.
1. What can’t dogs do from paragraph 1?| A．Look for drugs. | B．Cure (治疗) disease. | C．Find missing people. |
a. He taught dogs to smell special boxes.
b. He gave dogs harder smelling jobs.
c. He used food to train the dogs.
d. Dogs could smell the stress.
| A．a-b-c-d | B．a-c-b-d | C．a-d-c-b |
| A．Wilson got 720 samples from stressed people. |
| B．Scientists all felt very sorry to know the result. |
| C．Dogs could find out the stressed sample most of the time. |
| A．Because it helps people to cure stress diseases. |
| B．Because more dogs can be used to look for people. |
| C．Because people can train dogs to make people less stressed. |
| A．In a story book. | B．In an art magazine. | C．In a science newspaper. |
Dogs like living with people. A dog can be a very good friend. He can do a lot of things for people ① Some dogs help people to look after sheep, other dogs help them to find lost children. And some of the dogs can help the blind(盲人)do things.
Many years ago there was a very good dog. His name was Seeing Eye dog.②现在我们能在世界各地看到这种狗。They are working for the blind. The Seeing Eye dog is strong, good and easy to train(训练). He helps the blind to walk from place to place.
Before a dog becomes a Seeing Eye dog, he must go to a training school for about three months. First the dog has to learn to sit or stay when he hears the trainers call. In his next lesson the dog learns to make his trainer across busy streets. The dog has many things to learn. ③And in every lesson he must learn to do one thing over and over again for many times.
④在训练学校的末期他必须参加测试。When he passes the tests, the Seeing Eye dog will do the things by himself.
Now he can help blind people. The new master(主人) may be a man, a woman, or even a child. ⑤ It takes the dog and his blind master about a month to learn to work and live together.
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