It is really disturbing to me that my once best friend _______ to me recently. Worse still, I don't know

what I have done wrong.    [ ]

A. avoids to talk      

B. escapes talking       

C. stops to talk      

D. avoids talking

有静电接地要求的管道，各段管子间应导电。管道系统的对地电阻值超过()时，应设两处接地引线。

A.20Q

B.50Q

C.80Q

D.100Q