【单选题】
下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。
{{B}}第一篇{{/B}}
Life expectancy rates in the United States are at an all- time high, with people born in 2005 projected to live for nearly 78 years, a new federal study finds.
The finding reflects a continuing trend of increasing life expectancy that began in 1955, when the averageAmerican lived to be 69.6 years olD、By 1995, life expectancy was 75.8 years, and by 2005, it had risen to 77.9 years, according to the report released Wednesday.
"This is good news," said report co - authorDonna Hoyert, a health scientist at the NationalCenter for Health Statistics. "It’s even better news that it is a continuation of trends, so it is a long period of continuing improvement. "
Despite the upward trend, the United States still has a lower life expectancy than some 40 other countries, according to the U. S.Census (人口普查)Bureau. The country with the longest life expectancy isAndorra at 83.5 years, followed by Japan, Macau, San Marino and Singapore.
Much of the increase owes to declining death rates from the three leading causes of death in the country - heart disease, cancer and stroke.
In addition, in 2005, the U. S. death rate dropped to an all -time low of less than 800 deaths per 100,000.
Dr.David Katz, director of the Prevention ResearchCenter at Yale University School of Medicine, said, "News that life expectancy is increasing is, of course, gooD、But the evidence we have suggests that there is more chronic disease than ever in the U. S."
Adding years to life is a good thing, Katz saiD、"But adding vital life to years is at least equally important. If we care about living well, and not just longer, we still have our work cut out for us," he saiD、
B．increasing life expectancy rates in some other countries
C．a rise in the rate of chronic disease
D．a declining birth rate
网考网参考答案：A
网考网解析：
短文的第五段说，美国预期寿命的增加很大程度上归功于三大主要疾病——心脏病、癌症和中风——导致的死亡率的下降。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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