目前人类利用的淡水资源主要是
A:江河水、冰川
B:冰川、浅层地下水
C:江河湖泊水、浅层地下水
D:江河湖泊水、海洋水
He was just falling asleep _____ there was a loud knock on the door.
北魏孝文帝迁都洛阳的原因是( )
— ______ do you have the drawing lessons? The pictures you draw are so beautiful. — Once a week. I began having drawing lessons at the age of five.
求涂色部分的面积.
面积是____ m2