11. A) Because they can't afford to.

B) Because they think small houses are more comfortable to live in.

C) Because big houses are usually built in the countryside.

D) Because they prefer apartments.

12. A) Because many young people have moved into comfortable apartments.

B) Because many old houses in the bad part of the town are not inhabited.

C) Because many older people sell their houses after their children leave.

D) Because many people have quit their old house to build new ones.

13. A) They have to do their own maintenance.

B) They have to furnish their own houses.

C) They will find it difficult to make the rest of the payment.

D) They will find it difficult to dispose of their old-style furniture.

例题

14. A) They are not active hunters.

B) They don't sleep much.

C) They are often seen alone.

D) They don't eat much.

15. A) To catch the birds.

B) To look for shade in the heat of the day.

C) To catch other animals.

D) To look for a kill made by another animal.

16. A) They are larger in size.

B) They run faster.

C) They have to hunt more to feed the young.

D) They are not as lazy as the males.

例题

17. A) Less than 30 minutes.

B) From 30 to 45 minutes.

C) At least 45 minutes.

D) More than 45 minutes.