Christmas is my favourite 1. On Christmas, my family 2 my aunt,uncle and cousin to our house. We 3 gifts to each other. I give my cousin a 4 gift. We sing the Christmas 5 together. I think we are very happy.
东北平原主要的农作物是( )
“世界因不同而精彩,交流因不同而必要,创新因交流而迸发。”这要求我们( )
函数f(x)=Asin(ωx+φ)(A>0,ω>0)的图象如图所示,则f (1)+f (2)+f (3)+…f (2015)=____