--- What        it be?

--- It         be a man, for it is not moving. It      be a dustbin, I think.

A．can, may, must

B．can, can’t, must

C．can, must, can

D．may, may not, could

牛肾的特征属于（）

A、有沟多 * * 肾

B、平滑多 * * 肾

C、平滑单 * * 肾

D、有沟单 * * 肾