B. Some of them are easier to suffer heart attacks again in the future.

C. Half of them won't suffer heart attacks any more in the future.

【答案】18. B 19. B 20. A

【解析】

此题为听力题，解析略。

【18题详解】

此题为听力题，解析略。

【19题详解】

此题为听力题，解析略。

【20题详解】

此题为听力题，解析略。

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，选出最佳答案。

　　In 1997, Mary gave a present of $ 500, 000 to the University of Southern Mississippi. She wanted to help poor students. It was a very generous thing to do. But her friends and neighbors were surprised. Mary was a good woman. She went to church. She was always friendly and helpful. But everyone in her town knew that Mary was not rich. In fact, she was poor.

　　How did a poor 89-year-old woman have so much money? Mary was born in 1908 in Hattiesburg, Mississippi. She had to leave school when she was eight years old to help her family. She took a job washing clothes. She earned only a few dollars a day. She washed the clothes by hand. Then she hung the clothes to dry. She did this for nearly 80 years. In the 1960s, she bought an automatic washer and dryer. But she gave them away. She did not think they got the clothes clean enough！At that time, many people started to buy their own washers and dryers. Mary did not have much work, so she started to iron clothes instead.

Mary never married nor had children. Her life was very simple. She went to work and to church. She read her Bible. She had a black-and-white television. But she did