People often say that a dog is man’s best friend. Over thousands of years, people have taught dogs to do many kinds of work besides guarding the home. For example, sheepdogs are famous for their ability to control a flock of hundreds of sheep and protect them from danger.
      Dogs have been used to aid disabled people for centuries. A guide dog can lead its blind owner. Nowadays, dogs can be taught to turn on light switches, open refrigerator doors and take the telephone for their disabled owners. For a number of people, dogs are not only pets but also best friends for both young and old members of the family.

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1.Who is man's best friend?

A A cat.

B A dog.

C A pig.

D A mouse.

解析：选B。细节理解题。根据第一段第一句People often say that a dog is man’s best friend.可知，故选B。

2.Can dogs do a lot of things?

A Yes, they can.

B No, they can’t.

C Yes, they are.

D No, they aren’t.

解析：选A。细节理解题。根据第一段第二句 Over thousands of years, people have taught dogs to do many kinds of work besides guarding the home.可知，故选A。

3.Sheepdogs are famous for their ability to control a flock of hundreds of _____.

A horses

B pigs

C sheep

D monkeys

解析：选C。细节理解题。根据第一段第三句sheepdogs are famous for their ability to control a flock of hundreds of sheep可知，故选C。

4.Dogs can do the following things except ______.

A Dogs can guard the home.

B Dogs can turn on light switches for their disabled owners.

C Dogs can talk and sing.

D Dogs can control a flock of sheep.

解析：选C。细节理解题。根据第二段最后一句For a number of people, dogs are not only pets but also best friends for both young and old members of the family.可知，故选C。

5.What’s the best title of the article?

A Cute Dogs

B Good Pets

C Pet Dogs

D Dogs, Our Best Friend

解析：选D。主旨大意题。这篇文章主要讲了狗是人类最好的朋友，故选D。