too much sugar is bad your teeth.
A:Eat; to
B:Eating; to
C:Eating; for
已知向量a→,b→满足|a→|=1,|b→|=2,|a→﹣b→|=2,求|a→+b→|.
若函数y=121-x+m的图像与轴有公共点,则的取值范围是( )
Amy is an English girl. ____ is very beautiful. ____ eyes are blue.