We should learn to experience and enjoy failure and_____ought we to be so discouraged, even in despair.

A．in no time

B．by all means

C．by no means

D．in this case

我们都知道有些蛇有剧毒，那你知道毒性最强的是哪种吗？（）

A.黄腹海蛇

B.内陆太攀蛇

C.蝰蛇