Now the Chinese eat      as they actually need every day.

A．twice as much protein

B．twice protein as much

C．protein as twice much

D．protein twice as much

关于龋病发病率以下说法正确的是（）

A.在调查期间某一人群患龋的频率

B.在调查期间某一人群患龋的新增人数

C.在调查期间某一人群新发龋的频率

D.至少在1年时间内某一人群新发龋的频率

E.以上说法都不对