用达尔文的进化论观点分析，动物的保护色是 [ ]

A．环境进化的结果

B．适应环境的结果

C．自然选择的结果

D．人工选择的结果

There isn’t such a word ______ I know.

A．as soon as

B．as long as

C．so long as

D．so far as