Sometimes the tension produced by fears is so great that we cannot Suppress it. At such times we need to ______ the tension by laughing or crying. '

A．in
B．of
C．with
D．of

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.