The phrase "color of the spirit" means______.

A．We stand to gain most from the reading of political treatises.
B．The first step on the moon' was mankind' s most important moment.
C．The function of poetry is to elevate the relationship between the practical arts and everyday life.
D．Great literature must address itself to fundamental philosophical truths rather than to material progress.

A．Educated people do not treat nature as children do.
B．Nature will always conquer even the most learned person.
C．Nature is unpredictable and human beings cannot understand it.
D．A true wise person does not lose his appreciation of nature.