Each of the 400 people received from their boss ______ gift － “Who moved my cheese?” , ______ best-seller in the US, which helped them understand how to deal with changes in their lives and work.

A．the; /

B．a; the

C．a; a

D．the; a

对于呈气体状态或易挥发的化学毒物的排泄，下列哪一项描述是正确的（）。

A.通过主动转运的方式经肺泡壁排出气体

B.排出的速度与吸收的速度成反比

C.血液中溶解度低可以缓解其排除速度

D.肺通气量加大可以加速其排除速度

E.以上都正确