克服(　　)是导游人员做好导游工作的前提条件之一。

A．消极情绪

B．厌烦情绪

C．倦怠情绪

D．低沉情绪

We will be for ______ promises to volunteer to help us solve the puzzling problem.

A．whoever

B．any one of them

C．those who

D．anyone