北大16秋《大学英语3-第四组》在线作业

一、阅读理解(共10题，每题2分，共20分)

请阅读以下文章，回答文章后的五个小题。每个小题只有一个最佳选项。

1).

Breastfeeding (母乳喂养) for a month or longer appears to reduce a woman's risk of getting diabetes (糖病) later in life, according to a new study. The breastfeeding and diabetes link has been reported in other studies, according to researcher Eleanor Schwarz. Yet, her study makes the link easier to believe. Her study is published in a journal of medicine in America. Schwarz and her colleagues looked at data about breastfeeding practices. They evaluated data on 2,233 women from California. Of those, 405 were not mothers, 1,125 were mothers who breastfed for at least a month, and 703 were mothers who had never breastfed. They were 40 to 78 years old.

According to Schwarz's study, the risk of getting a diagnosis (诊断) of Type 2 diabetes for women who breastfed all their children for a month or longer was similar to that of women who had not given birth. But mothers who had never breastfed were nearly twice as likely to develop diabetes as women who had never given birth. Mothers who never breastfed were about 1.4 times as likely to develop diabetes as women who breastfed for one to three months, Schwarz found.

While one month of breastfeeding appears to make a difference, Schwarz says, even longer is better. “Previous studies have shown the longer the mom breastfeeds, the more benefit for her body.” Many experts recommend breastfeeding for six months and continuing for a year, she says.

The diabetes-breastfeeding link is probably explained by belly fat. Mothers, who don't breastfeed, as they get older, may have more belly fat, as breastfeeding helps new mothers take off weight. “Belly fat increases the risk of diabetes as you get older,” she says.

The finding isn't surprising at all, says Kimberly Gregory. She often gives advice to women who get diabetes (occurring during pregnancy (怀孕)) that they are at risk for later getting Type 2 diabetes and suggests they breastfeed. The new findings will probably inspire Gregory to add to the-advice she gives moms-to-be about the benefits of breastfeeding. She often focuses on the benefits to the baby.

1. According to the first paragraph, which of the following statements is TRUE?

A. About two thousand and two hundred old women took part in the study.

B. Eleanor Schwarz's research program was about men and women who suffered from diabetes.

C. Over one fifths of the women never got married.

D. Eleanor Schwarz's results seem more reliable.

2. According to Schwarz's findings, who are more likely to get diabetes later in life?

A. Those mothers who had never breastfed.

B. Those mothers who never gave birth.

C. Those mothers who breastfed for a month.

D. Those mothers who breastfed for six months.

3. Which of the following statements would Schwarz agree with?

A. Breastfeeding is not advisable because it is not good for a mom to keep a good shape.

B. Breastfeeding can greatly reduce a mother's chances of getting all kinds of serious disease.

C. Breastfeeding for a month is highly recommended: the longer, the better.

D. Breastfeeding for a month or longer makes babies smarter.

4. What does the author mean by “moms-to-be” in the last paragraph?

A. Women who are pregnant, especially for the first time.

B. Women who dream of having babies for the first time.

C. Women who already have children.

D. Women who have just got babies for the first time.

5. Which of the following is an appropriate title for this passage?

A. Breastfeeding May Enhance Babies' Chances of Survival

B. Breastfeeding May Lower Moms' Diabetes Risk

C. Breastfeeding May Become Very Fashionable in Near Future

D. Breastfeeding May Help Women Lose Weight

2).

As the school year kicks off, parents are once again straggling to cajole(哄编) and, if need be, drag their exhausted teens out of bed. That image may make you laugh, but lack of sleep is no joke. Teenagers who don’t get enough rest have more learning, health, behavior and mood problems than students who get at least nine hours a night. Long-term lack of sleep is tied to heart disease, overweight, depression and a shortened life span in adults, indicating the importance of establishing good sleep habits early in life. Lack of sleep can be especially deadly for teens; car accidents are the leading cause of death among teenagers, and safety experts believe sleepy driving is a major factor.

Unfortunately, few teenagers get the sleep they need. In a survey of middle- and high-school students, University of Colorado researchers found that 82 percent said they woke up tired and unrefreshed, and more than half had trouble concentrating during the day at least once a week.