阅读下面短文，掌握其大意，然后从各题中所给的四个选项中，选出一个最佳答案.

　　How long can you expect to live? That is to say. 1 is the average life expectancy (寿命) for us?

　　The average life expectancy 2 from country to country, but for many countries nowadays, the average life expectancy is over 70 years. That 3 that the average 4 will live to be at least 70 years old．

　　Actually, in the United States in 1980, the average life expectancy was 73.8 5 . This age is a little 6 than the average life expectancy in 1970 -- 70.8 years.

　　In fact, if you look at the average life expectancy 7 for this century, you'll see that the 8 gets higher every year. For instance, in 1900 it was 47.3, in 1910 it was 50, in 1920 it was 54.1, 1930 was 59.7, 1940 was 62.9, 1950 was68.2, and in 1960 the average lifetime was 69.7 years.

　　 9 does the average life expectancy 10 getting higher and higher? The main 11 are related to 12 care. First, health care, 13 general health care for 14 children has 15 steadily. Second, a large number of 16 have been 17 in the past 40 or 50 years. These 18 drug can prevent and cure many 19 that used to be fatal (致命的) in the 20 .

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阅读下面短文，掌握其大意，然后从各题中所给的四个选项中，选出一个最佳答案.

　　How long can you expect to live? That is to say. 1 is the average life expectancy (寿命) for us?

　　The average life expectancy 2 from country to country, but for many countries nowadays, the average life expectancy is over 70 years. That 3 that the average 4 will live to be at least 70 years old．

　　Actually, in the United States in 1980, the average life expectancy was 73.8 5 . This age is a little 6 than the average life expectancy in 1970 -- 70.8 years.

　　In fact, if you look at the average life expectancy 7 for this century, you'll see that the 8 gets higher every year. For instance, in 1900 it was 47.3, in 1910 it was 50, in 1920 it was 54.1, 1930 was 59.7, 1940 was 62.9, 1950 was68.2, and in 1960 the average lifetime was 69.7 years.

　　 9 does the average life expectancy 10 getting higher and higher? The main 11 are related to 12 care. First, health care, 13 general health care for 14 children has 15 steadily. Second, a large number of 16 have been 17 in the past 40 or 50 years. These 18 drug can prevent and cure many 19 that used to be fatal (致命的) in the 20 .

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