The WTO cannot live up to its name _______ it does not include a country that is home to one fifth of mankind.

A．as long as

B．while

C．if

D．even though

精子活动良好是指精子（）.

A.呈前向直线运动

B.呈缓慢或呆滞的前向运动

C.在原地打转或抖动

D.不活动，加温后活动迟缓

E.不活动，加温后仍不活动