我国古代一直都是农业大国,下列最早在我国种植的粮食作物是( )
①水稻 ②小麦 ③粟 ④黍
A:①④
B:②④
C:①③
D:②③
想对朋友说“祝你生日快乐”,可以说:
如图,直线l、l′、l″表示三条相互交叉的公路,现计划建一个加油站,要求它到三条公路的距离相等,则可供选择的地址有( )
Being happy is a skill that can be learned like a foreign language, and one way to ______ ourselves to be happy is to write down the little things that cheer us up each day.