It struck me like lightning how difficult it must have been for a woman to get a medical training so long ago _____ women’s education was always placed second to men’s.

A．while

B．when

C．until

D．as

在环境噪声大于60分贝的场所位置的扬声器，气播放范围内最远点的播放声压极应高于背景噪声（）分贝。

A、10

B、15

C、20

D、25