单项选择题

According to Paragraph 2, which of the following statements is true

A．Human life span would probably not increase rapidly.
B．The human life span will increase more rapidly in developed country.
C．If heart disease and cancer could be cured, the average life span will increase more rapidly.
D．It is easy to prolong people's life beyond 85 in developed country.

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单项选择题Why is it forgivable for people to hope that they will live longer in the future than now

A．Because people want to live as long as possible,
B．Because life expectancy has doubled since the mid-19th century.
C．Because many people live past 100 and the oldest individuals have reached more than 100.
D．Because great progress is made in medicine and health sciences during the past 150 years.