四、阅读理解

　　A New Strategy to Overcome Breast Cancer

　　Post-menopausal(绝经后)women who walk for an hour a day can cut their chance of breast cancer significantly,a study has suggested. The report ,which followed 73,000 women for 17 years,found walking for at least seven hours a week lowered the risk of the disease.The American Cancer Society team said this was the first time reduced risk was specifically linked to walking. UK experts said it was more evidence that lifestyle influenced cancer risk.

　　A recent poll for the charity Ramblers a quarter of adults walk for no more than an hour a week,but being active is known to reduce the risk of a number of cancers.This study, published in Cancer Epidemiology,Biomarkers&Prevention,followed 73.615 women out of 97,785 aged 50-74 who had been recruited by the American Cancer Society between 1992 and 1993,so it could monitor the incidence of cancer in the group.

　　They were asked to complete questionnaires on their health and on how much time they were active and participating in activities such as walking,swimming and aerobics(有氧运动)and how much time they spent sitting watching television or reading.They completed the same questionnaires at two-year intervals between 1997 and 2009.Of the women,47% said walking was their only recreational acivity.Those who walked for at least seven hours per week had a 14% lower risk of breast cancer compared to those who walked three or fewer hours per week.

　　Dr.Alpa Patel,a senior epidemiologist at the American Cancer Society in Atlanta,Georgia,who led the study,said:”Given that more than 60% of women report some daily walking,promoting walking as a healthy leisure-time activity could be an effective strategy for increasing physical activity amongst post-menopausal women.We were pleased to find that without any other recreational activity, just walking one hour a day was associated with a lower risk of breast cancer in these women.””More strenuous(紧张的)and longer activities lowered the risk even more.

　　Baroness Delyth Morgan, chief executive of Breast Cancer Campaign,said:”This study adds further evidence that our lifestyle choices can play a part in influencing the risk of breast cancer and even small changes incorporate into our normal day-to-day activity can make a difference.”

　　She added:”We know that the best weapon to overcoming breast cancer is the ability to stop it occurring in the first place. The challenge now is how we turn these findings into action and identify other sustainable lifestyle changes that will help us prevent breast cancer.”

　　31. All of the following factors relating to cancer risk were mentioned in the passage______EXCEPT_______

　　A. breathing exercise

　　B.regular walking

　　C.recreational activity

　　D.lifestyle choices

　　32. It can be inferred from Dr. Alpa Patel’s study that____.

　　A. women have fewer chances of physical activity

　　B. daily walking could cut the chance of breast cancer

　　C. leisure-time activity is not associated with cancer risk

　　D. walking is not recommended for women with breast cancer

　　33. Dr. Alpa Patel was_____.

　　A. head of the survey study

　　B. chief editor of Cancer Epidemiology

　　C. chair of the American Cancer Society

　　D. chief executive of Breast Cancer Campaign

　　34. Which of the following statements is true according to the passage?

　　A. Most women take walking as their only recreational activity.

　　B. The study aims to track the health conditions of its subjects.

　　C. Walking was the only recreational acitivity for about half of the women

　　D. Irregular walking increased the risk of breast cancer in post-menopausal women

　　35. The word “sustainable”in the last paragraph is closest in meaning to

　　A. continuable

　　B. affordable

　　C. available

　　D. Persistent

　　答案：ABACA

　　First Self-contained Heart Implanted 【首例整套人工心脏移植】

　　A patient on the brink of death has received the world’s first self-contained artificial heart—a battery-powered device about the size of a softball that runs without the need for wires, tubes or hoses sticking out of the chest.

　　Two surgeons from the University of Louisville implanted the titanium and plastic pump during a sever-hour operation at Jewish Hospital Monday. The hospital said the patient was “awake and responsive” Tuesday and resting comfortably. It refused to release personal details.

　　The patient had been expected to die within a month without the operation, and doctors said they expected the artificial heart to extend the person’s life by only a month. But the device is considered a major step toward improving the patient’s quality of life.

　　The new pump, called AbioCor, is also a technological leap from the mechanical hearts used in the 1980s, which were attached by wires and tubes to bulky machinery outside the body. The most famous of those, the Jarvic-7, used air as a pumping device and was attached to an apparatus about the size of a washing machine.

　　“I think it’s potentially a major step forward in the artificial heart development,” said Dr. David Faxon, president of the American heart Association. However, he said the dream of an implantable, permanent artificial heart is not yet a reality: “This is obviously an experimental device whose long-term success has to be demonstrated.” Only about half of the 4,200 Americans on a waiting list for donor hearts received them last year, and most of the rest died.

　　Some doctors, including Robert Higgins, chairman of cardiology at the Medical College of Virginia in Richmond, said artificial hearts are unlikely to replace donor hears.

　　“A donor heart in a good transplant can last 15 to 30 years,” he said. “It’s going to be hard to replace that with a machine.”

　　The AbilCor has a 2-pound pumping unit, and electronic controls that adjust the pumping speed based on the body’s needs. It is powered by a small battery pack worn outside the body that transmits current through the skin.

　　36. 前两段告诉Self-contained artificial heart

　　A. was made of titanium and pump

　　B. had brought the patient to the brink of death

　　C. did not need to get power from outside the body

　　D. was invented by two surgeous from university of Louisville

　　37. 病人接收 the first self-contained heart

　　A. could not afford a donor heart

　　B. was said to be in a good condition the next day after the operation

　　C. died two month’s after the heart implantation

　　D. was reluctant to release his or her personal information

　　38. 第四段中the Jarvic-7 is

　　A. the most expensive mechanical heart

　　B. a mechanical heart used in the 1980s

　　C. as advanced as A biocor

　　D. replacing A biocor

　　39. 通过Dr. David Faxon, the self-contained heart is

　　A. a milestone in the artificial heart development

　　B. still in the experimental stage

　　C. an implantable, permanent artificial heart

　　D. unavailable to all those Americans waiting for donor hearts

　　40.从文章推断出donor heart

　　A. saved the lives of about 2100 Americans the year before the report

　　B. will be replaced by self-contained artificial hearts sooner or later

　　C. are more popular and cheaper than self-contained artificial hearts

　　D. can help patients survive less than 15 years if they are in good transplant.

　　答案：ABBBA