Your advice would be（）valuable to him, who is at present at his wits' end.

A.exceedingly

B.excessively

C.extensively

D.exclusively

企业通过对（）的环境分析，就能确认自己在什么地方应加强防守。

A.行业对手

B.竞争对手

C.微观环境

D.宏观环境