A. Taking a four-year payment plan.

B. Taking a three-year payment plan.

C. Taking a five-year payment plan.

听第10段材料，回答第17至20题。

17. What is the most difficult problem for most mothers in the U.S.?

A. They don't have enough money to support their children.

B. U.S. labor policies don't support working mothers.

C. They can't balance their work and family very well.

18. On which day can Barnes spend with her children during the week?

A. Monday. B. Thursday. C. Friday.

19. What does Barnes do?

A. She is a partner in a law firm.

B. She is a teacher.

C. She is a babysitter.

20. What do working mothers want?

A. Caring parents' attention.

B. An easier job.

C. Society to value happy children.

第二部分：阅读理解（共两节，满分 40分）

第一节：（共15小题；每小题2分，满分30分）

　　阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。

　　Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership which is good for both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (寄生虫) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.

Sometimes an animal has a plant partner. The relationship develops until the two