Since 1955, life expectancy rates in the U. S. have Compared with the country with the longest life expectancy, the U. S. is

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问题 Since 1955, life expectancy rates in the U. S. have
Compared with the country with the longest life expectancy, the U. S. is

选项 A、nearly 3 years behind.
B、nearly 4 years behind.
C、nearly 6 years behind.
D、nearly 8 years behind.

答案C

解析 短文的第四段说,预期寿命最长的国家是安哥拉,为83.5岁,而美国只有78岁,因此相差大约6岁。
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