She was very friendly to __________.( )
A:us
B:we
C:our
已知椭圆C: x2a2 + y2b2 =1(a>b>0)的短轴长为2,且函数y=x2﹣ 6516 的图象与椭圆C仅有两个公共点,过原点的直线l与椭圆C交于M,N两点.
温度3℃比-7℃高____℃;温度-8℃比-2℃低____℃.