Though brought up in Los Angeles, Steven Davidson spent his whole life      in New York．

A．mostly

B．constantly

C．roughly

D．merely

平流沉淀池刮泥和排泥操作有两种形式，I!P（）

A.自动刮（排）泥和人工刮（排）泥

B.间歇刮（排）泥和连续刮（排）泥

C.程序控制刮（排）泥和连续刮（排）泥

D.定时刮（排）泥和间歇刮（排）泥