醋:酸
A.叶:绿
B.花:红
C.雪:白
D.雨:涝
参考答案:C
解析:【解析】醋是酸的,雪是白的。所以答案选C。
Don’t leave the water ______ while you brush your teeth.
A.run
B.running
C.being run
D.to run
解方程:
(1)x2-4x-45=0
(2)x2-4x=2.