2. 外语
  3. Since 1955, life expectancy rates in the U. S. have The increase in the U. S. life expectancy is mostly due to

Since 1955, life expectancy rates in the U. S. have The increase in the U. S. life expectancy is mostly due to

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问题 Since 1955, life expectancy rates in the U. S. have
The increase in the U. S. life expectancy is mostly due to
选项 A、declining death rates from heart disease, cancer and stroke.
B、increasing life expectancy rates in some other countries.
C、a rise in the rate of chronic disease.
D、a declining birth rate.
答案A
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。
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