Questions 13 to 15 are based on the passage you have just heard.

Passage Two

    Most Americans don’t eat enough fruits, vegetables or whole grains. Researchers now says adding fiber to the teen diet may help lower the risk of breast cancer.

    Conversations about the benefits of fiber are probably more common in nursing homes than high schools. But along comes a new study that could change that. Kristi King, a diet specialist at Texas Children’s Hospital finds it’s hard to get teenager patients’ attention about healthy eating but telling them that eating lots of high-fiber foods could reduce the risk of breast cancer before middle age. That’s a powerful message.

    The new finding is based on a study of 44,000 women. They were surveyed about their diets during high school, and their eating habits were tracked for two decades. It turns out that those who consumed the highest levels of fiber during adolescence had a lower risk of developing breast cancer, compared to the women who ate the least fiber. This important study demonstrates that the more fiber you eat during your high school years, the lower your risk is in developing breast cancer in later life.

    The finding points to long-standing evidence that fiber may reduce circulating female hormone levels, which could explain the reduced risk. The bottom line here is the more fiber you eat, perhaps, a lower level of hormone in your body, and therefore, a lower lifetime risk of developing breast cancer. High-fiber diets are also linked to a reduced risk of heart disease and diabetes. That’s why women are told to eat 25 grams a fiber a day—men even more.

13. What does the new study tell about adding fiber to the teen diet?

解析：C。本题目为细节题。问题为：关于在青少年的饮食中增加膳食纤维的最新研究告诉我们什么？原文所在句：Most Americans don’t eat enough fruits, vegetables or whole grains. Researchers now says adding fiber to the teen diet may help lower the risk of breast cancer.可见，多数美国人饮食缺少水果、蔬菜或者全麦，现在的研究者认为在青少年的饮食中加入膳食纤维会帮助降低乳腺癌的风险。正确选项为：C）It helps people to avoid developing breast cancer。