下列关于水利水电工程截流的说法正确的是()。

A.平堵法较立堵法的单宽流量及最大流速都小

B.立堵法不适用于地质条件较差的河道截流

C.宽戗截流可以分散水流落差，且抛投强度较小

D.双戗截流可减少上戗进占的龙口落差和流速

E.加大截流施工强度可以减少龙口流量和落差

It is considered by some people that to pay to see a movie will be foolish        you can see it on TV for nothing.

A．where

B．when

C．however

D．that