The word health can be used in a number of ways. In the past, health only the absence of disease or illness. Today, though, health has a broader meaning. Health is the state of your well-being that includes how you feel physically, mentally, and socially. Wellness is another term that describes this broader view of health. You can understand the need for a broader definition if you think about how health in your life is different from health in your grandparents' lives.

　　In 1900, the main causes of death were diseases that were spread by bacteria(细菌) and viruses(病毒).If you had lived then, the danger of your dying from pneumonia(肺炎) would have been three times greater than the danger of your dying from cancer.

　　The diseases that were most common in 1900 affected people of all ages. It is not surprising, then that around 1900, the emphasis of health was on freedom from illness. Today many of the diseases that were common in 1900 can be prevented or cured by improved medicines and methods of sanitation(卫生). Most diseases now are likely to occur later in life. You as a teenager will probably not have to think about the same threats to your health as your grandparents did.

　　These improvements in health conditions mean that not only can you now enjoy a better life, but you also have a greater chance of having a longer life. Conrtolling diseases has increased the life expectancy in the United States. Grenerally, people born more recently have higher life expectancies. Since 1900, the life expectancy in the United States has increased by more than 27 years. It has increased from 47 years for those born in 1900 to 74 years 1981.

　　26.According to Paragraph 1, health and wellness ______.

　　A.can be used interchangeably on all occasions

　　B.are different in that the latter has a broader sense

　　C.had the same meaning in the past

　　D.both refer to the state of your well-being

　　27.Which of the following statements is true?

　　A.Diseases caused by bacteria and viruses were incurable in 1900.

　　B.Bacteria and viruses are the main causes of death today.

　　C.Medicines for curing pneumonia were not available in 1900.

　　D.Pneumonia caused as many deaths in 1900 as cancer does today.

　　28.“Life expectancy” in the last paragraph most probably means ____.

　　A.the kind of life that a person may expect to live

　　B.the mode of life that a group of people have lived

　　C.the length of time that a person or an animal has lived

　　D.the length of time that people may expect to live

　　29.On an average, people in America who were born in 1900 ______.

　　A.had a life-span of 74 years

　　B.lived a shorter but better life than those born later

　　C.lived to 47 years of age

　　D.lived 27 years longer than those born in 1981

　　30.The intended readers of the passage are _______.

　　A.teenagers

　　B.the diseased

　　C.adults

　　D.aged people

　　Passage Three

　　Questions 31 to 35 are based on the following passage.