四川盆地是我国以下哪些农作物的最大产区( )
①水稻 ②高粱 ③小麦 ④油菜籽
A:①②
B:①④
C:②③
D:①②③④
图片排序。
A. ____
B. ____
C. ____
D. ____
E. ____
It is said that aliens are living in the world that is undiscovered.