【单选题】

Questions 21—23 are based on a report about obesity. You now have 15 seconds to read Questions 21—23. According toDr. Serge Jabbour, what message does the study carry .A．People have to work early on their weight.

B．Overweight people have shorter life expectancies.
C．Smoking is damaging to life expectancy.
D．If people who are overweight by their mid-30’s to mid-40’s lose some weight later on, they will carry a lower risk of dying.