People in Canada have many reasons to like animals. One of them might be that their family ties are not as close as ours.③ When children grow up, they leave their parents and start their own life. Then the old will feel lonely, but pets can solve this problem. They can be good friends and never leave them alone.

根据文章内容，选择正确答案：

1. The passage mainly talks about____ .

A. how to keep disease from pets

B. pets in Canada

C. how to take good care of pets

D. life of the old in Canada

2. They give their pets injections before keeping them at their houses because ____.

A. the pets are sick

B. the pets are wild

C. they want to stop them from getting sick

D. they want them to sleep on the way home

3. In Canada, children leave their parents when they grow up because ____.

A. they don't love their parents any more

B. they can only find jobs far from their parents

C. their parents houses are too small

D. they wouldn't depend on their parents any more

4. Which of the following is TRUE？

A. People buy animal food only at the animal food stores.

B. Pets eat better than people.

C. Almost every family has a birdcage in his house.