【单选题】Questions 6 to 10 are based on the following passage There are many older people in the world and there will be many more. A little-known fact is that over 60 percent of the older people live in devel...
A.
is bigger in developed countries than in developing countries
B.
is one-seventh of the population in developing countries
C.
will increase much faster in China than in France
D.
will be sixty percent in developing countries by 2020