Citizens of the world’s wealthiest countries may live longer than previously predicted, according to a study sponsored by the National Institute on Aging. By 2050, people in the G-7 nations (Canada, France, Germany, Italy, Japan, the United Kingdom, and the United States) may be living anywhere from 1.3 years to 8 years longer than official estimates now predict. Researchers at Mountain View Research in Los Altos, California, examined 50 years of mortality data and found a long-term decline in death rates. That may mean that fewer workers will have to support many more elderly in the future than governments currently expect.
TEXT H
First read the following question.
84. Which is the best title of the passage？

A. How to protect your eyesight.
B. How to choose your computer.
C. A few tips for computer users.
D. Eye trouble and headache.