[填空题]A. a longer life expectancy for most people
B. artists are adroit in dealing with their painting subject
C. engage in the medical profession
D. careful study and experimentation
E. the chief centers for medical care in most countries
F. science and technology

Doctors are skillful in dealing with patients just as______.

[填空题]A. a longer life expectancy for most people
B. artists are adroit in dealing with their painting subject
C. engage in the medical profession
D. careful study and experimentation
E. the chief centers for medical care in most countries
F. science and technology

Doctors apply the knowledge gained through______.

[填空题]By 2000, life expectancy at birth in most developing countries increased from about 35-40 years in 1950 to ______.

[单项选择]

People tend to underestimate their life expectancy, and it’s not surprising. It’s the look around problem again: You generalize from life spans of older friends and family members and figures that’s what’s in store for you, too. But in an era of rapidly improving life expectancy, the look-around method once again gives the wrong answer.
Life expectancy at age 65 today is 15.6 additional years for woman. For both sexes, this represents an increase of more than two years just since 1970. By the time the youngest baby boomers turn 65, the Social Security Administration projects that life expectancy at that age could be as high as 18 more years for men and 21 years for women. Note that everyone runs very nearly a 50 percent "risk" of living longer than their life expectancy.
That reality makes retirement planning exceptionally difficult. On the day a husband and wife turn 65, they may have only a year or two of living between them to
A. To decide one’s life span according to one’s family members and friends.
B. To look around to find a better place to live.
C. To try to discover the best way to live longer.
D. To try to find a better college for your children.

[单项选择]

Life Expectancy in the Last Hundred Years

A. people B. killers C. invention D. nation

[单项选择]
Most people think of zoos as safe places for animals, where struggles such as difficulty finding food and avoiding predators don’t exist. Without such problems, animals in zoos should live to a ripe old age.
But matter may not be true for the largest land animals on Earth. Scientists have known that elephants in zoos often suffer from poor health. They develop diseases, joint problems and behavior changes. Sometimes, they even become infertile or unable to have babies.
To learn more about how captivity affects elephants, a team of international scientists compared the life spans of female elephants born in zoos with female elephants living outdoors in their native lands. Zoos keep detailed records of all the animals in their care, documenting factors such as birth dates, illnesses, weight and death. These records made it possible for the researchers to analyze 40 years of data on 800 African and A
A. have difficulty eating food
B. live to a ripe old age
C. are not afraid of predator
D. develop health problems