During the last three decades, the number of people participating in physical fitness programs___ sharply.

A．was increasing

B．has increased

C．had increased

D．will be increasing

估计脱水的程度，轻度脱水失水量为体重的：（）

A、5%以下

B、5%左右

C、5%~10%

D、10%左右

E、10%以上