The length of life depends on various factors.
Expectation of life is due to various factors.
Expectation of life is the average numbers of years that a person is expected to live.
The expectancy of life is the prediction of average years a person can live.
Long life is altering our life as well as our society.
Long life is changing our lives， changing our society.
1.Your account of what happened yesterday approximates _____ the real facts. （99.10）
答案：C.考点：此题考查词组approximate to 表示“与…接近”。
It is because the birthrate fell that our society had grown so old.
3.Nations are _______ as “aged” when they have 7 percent or more of their people aged 65 or above.
答案：B.本题考查词组：classify as 表示把… 列为。
The nearer a society approximates to zero population growth， the older its population is.
5.If you are now _____ ， you ought to pay more attention to your health. （01.4）
A. in the fifties
B. in your fifties
C. in fifties
D. in your fifty
答案：B. 本题主要考查词组in your fifties 表示“在你50岁时”。
6.We know that we are getting even older， and that the nearer a society approximates to zero population
Growth， the ______（old） its population is likely to be. （01.10）
答案：older.本题主要考查“the + 形容词比较级…。 the +形容词比较级”的用法。
7.In his composition there were no other errors ____ a few misspelled words. （02.4）
答案：D.本题主要考查词组“no other … than ”的用法，表示“除了…外，没有… ”。
8.We would like to take this opportunity to express our sincere ______（appreciate） of your help. （02.4）
答案：appreciation .本题中sincere 是形容词，因此后面接名词。Appreciate 是动词，其名词形式是appreciation .