You probably know that some dogs aren't just pets.They hold different kinds of jobs and have worked with people for thousands of years.
   What makes dogs such great workers？They learn fast，and they can also hear and smell better than we can This means dogs can do jobs that people can't.Some of their jobs may surprise you.
   Many dogs work with people to help them feel better.These dogs are called therapy dogs.Therapy dogs make people feel comfortable and keep them calm.These dogs sometimes visit sick people in hospitals to cheer them up.Therapy dogs need to have a friendly personality.They are trained to act calmly to new places，smells and people.
   Some dogs help people with disabilities.These dogs are called service dogs.Service dogs can do many different jobs.For example，some of them help people who cannot see well.These dogs are trained to keep people from stepping into traffic.They are also trained to lead their owners around objects.That way，their owners won't fall.
   Some dogs work to find people who are lost，hurt or trapped or find things that are hidden.These dogs are called search-and-rescue（營(yíng)救）（SAR） dogs.Many SAR dogs use their powerful nose to find people who need help.
   Dogs help us do many types of jobs.As our work changes and grows，so do the jobs we give to dogs.Their intellectual abilities，friendliness and powerful senses make dogs wonderful.
（1）How many kinds of dogs are mainly talked about in the passage？

B

B

A．Two.
B．Three.
C．Four
D．Five.
（2）What does the underlined word "therapy dogs"mean in Chinese？

C

C

A．營(yíng)救犬
B．導(dǎo)盲犬
C．治療犬
D．警犬
（3）According to the passage，we can learn that

A

A

.
A．therapy dogs act calmly to new places and people
B．SAR dogs usually keep people from stepping into traffic
C．service dogs are trained to find people who are lost or hurt
D．dogs can smell as well as people and do jobs that people can't
（4）This article may come from a magazine about

D

D

.
A．computer program
B．endangered animals
C．traditional skills
D．people and animals
（5）What is the main idea of the passage？

A

A

A．Dogs can do a lot to help people.
B．People can't survive without dogs.
C．Dogs are quite different from people.
D．The scientists are doing research on dogs.