．某班有48名同学，一次考试后的数学成绩服从正态分布N(80,100)，则理论上说在80分到90分的人数大约是       .

In Yunan Province, the drought is still getting worse．More than two billion yuan and eleven million people are       to drought relief work.

A．determined

B．accustomed

C．adapted

D．devoted