传说中远古时代的治水英雄是[ ]
A、尧
B、舜
C、禹
D、启
答案:C
将下图所示的装置放置在光亮的地方(日光没有直接照射),一段时间以后,可观察到的实验现象:量筒中__________;水槽中_________;饱和食盐水的pH _________(填变大、变小或不变),得到的气态产物有_______ 、_________ ,油状液滴的成分可能是(写分子式)___________ 。
Because he failed to pay his bill, the company _____ his electricity. [ ]
A. cut off
B. cut out
C. cut up
D. cut down