毒物或其活性代谢产物经哪个途径排出后，仍具有特殊的毒理学意义

A．呼吸道

B．胃肠道

C．肾

D．乳腺

E．汗腺

There is so much noise in the yard that I can't ________ my attention on my work. [ ]

A. attract  

B. pay

C. absorb  

D. concentrate