They asked some questions English.
平时我们说“乌云遮住了太阳”,是以____为参照物;说“太阳躲到乌云后面”,则是以____为参照物。
设一元二次方程(x-1)(x-2)=m(m>0)的两实根分别为α,β,且α<β,则α,β满足( )
-- ____ did the play football last week?
-- At the sports center.