Submitted by admin on Sun, 04/20/2014 - 18:30
definition:
The average period that a person may expect to live
sentence:
One in five adults is HIV positive and the average life expectancy at birth is just under 49 years.
They are now of an age that exceeds the average life expectancy in the countries where they live.
difficulty:
easy
toefl frequency:
2
toefl classification: