B. The health benefits of eating chocolate.

　　C. The effects of eating chocolate on happiness.

18. Who reported the best results?

　　A. People who ate no chocolate at all.

　　B. People who ate a lot of chocolate every day.

　　C. People who ate a moderate amount of chocolate every day.

19. What did the researchers say about the study?

　　A. There is still a lot of work to be done.

　　B. Milk chocolate was used in the experiment.

　　C. Eating too much chocolate had no positive impact on health.

20. Who might appreciate this news report most?

　　A. People who want to change their diet.

　　B. People who exercise regularly.

　　C. People who already eat chocolate fairly often.

第二部分：阅读理解（共两节,满分35分）

第一节（共10小题，每小题2.5分，满分25分）

　　阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。

　　In many developed countries, people who have high degrees begin to work longer than those who don't. About 65% of American men aged 62 ~ 74 with a professional degree are in the workforce (劳动人口), compared with 32% of men who only finish high school. This gap or difference is part of a deepening divide between the well-educated wealthy and the unskilled poor. Rapid technological advance has raised the incomes of the highly skilled while strictly reducing those of the unskilled, therefore, having a strong and profound influence on individuals and the society.

　　The world is facing an astonishing rise in the number of old people, and they will live longer than ever before. Over the next 20 years the global population of those aged 65 or more will almost double, from 600 million to 1.1 billion. The experience of the 20th century, when greater longevity (长寿) translated into more years in retirement rather than more years at work, has persuaded many observers that this shift will lead to slower economic growth, while the growing ranks of pensioners will create government budget problems.

Policies are partly responsible. Many European governments have abandoned policies that used to encourage people to retire early. Even the better-off must work longer to have a comfortable retirement. But the changing nature of work also plays a big role. Pay has risen sharply for the highly educated, and those people continue to receive rich rewards into old age because these days the educated elderly are more productive than the previous generation.