______ to forget is a good way to solve our problems and we can also deal with them by ______ of something worse.

A．Learn; think

B．Learning; think

C．Learning; thinking

D．Learn; thinking

在当今社会，无论是单位、企业和个人甚至国家都面临着各种风险。所有的工程项目也必然面临着各种各样的风险。这体现了风险的( )。

A．客观性

B．普遍性

C．规律性

D．可变性