A pet dog helps reduce children's stress. Petting a dog really helps children. Researchers looked at 643 young children. They found that children with a pet dog are less stressed than children without one. This will not surprise parents. They know dogs help children to develop.
We do not know if less stressed children have pet dogs, or if pet dogs make children less stressed. Pet dogs help children start conversations. This is often difficult for children. Children often tell their pets all their secrets. Sometimes a pet dog is so important that its name is the first word a baby says.

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1.How many children did researchers look at?

A 642.

B 643.

C 644.

D 653.

解析：选B。细节理解题。根据第一段第三句Researchers looked at 643 young children.可知，故选B。

2.Children with a pet dog are _______ than children without one.

A less stressed

B more stressed

C as happy as

D happier

解析：选A。细节理解题。根据第一段第四句 They found that children with a pet dog are less stressed than children without one.可知，故选A。

3.Why are parents not surprised?

A They know dogs help children to develop.

B They know pets help children to develop.

C They know cats help children to develop.

D They know dogs do not help children to develop.

解析：选A。细节理解题。根据第一段最后两句This will not surprise parents. They know dogs help children develop.可知，故选A。

4.What is difficult for children?

A Start writing.

B Start reading.

C Start listening.

D Start conversations.

解析：选D。细节理解题。根据第二段第二、三句Pet dogs help children start conversations. This is often difficult for children.可知，故选D。

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

A Cute Dogs.

B Good Pets.

C Pet Dogs.

D Pet Dogs Reduce Kids’ Stress.

解析：选D。主旨大意题。这篇文章主要讲了养宠物狗可以减少孩子的压力，故选D。