东北平原和华北平原种植的粮食作物分别是( )
A:春小麦、冬小麦
B:冬小麦、甜菜
C:冬小麦、春小麦
D:甜菜、冬小麦
— My father often stops me from _______ in the river alone.
— He's right. It's too dangerous.
下列动物中发育是完全变态发育的是( )
下列说法正确的是( )
到印度尼西亚旅游,游客可以( )