当洪峰来临时，通常会出现（）等现象。
A、流量急增
B、比降大，水流湍急
C、不正常水流多且强
D、以上都对
参考答案：D
数控风阀的优点有。
If you can't get to sleep, then get up and try to do something _______ lying in bed.[ ]
A.and
B.or
C.instead of
D.because of
