下列属于黄帝发明的是( )
①养蚕缫丝 ②建造宫室 ③发明车船 ④发明文字乐谱
A:①②
B:②③
C:③④
D:①④
关于我国土地资源叙述正确的有( )。
— Mum, I don't quite understand the Chinese saying.
— Dear, don't worry. _______ the years go by, you will get to know it.
读我国部分地区水系图(图),回答下列问题。