下例哪个比例尺最大( )
A:1:50000
B:十万分之一
C:图上1厘米代表实地距离2千米
D:1:25000
在分层设色地形图上,蓝色一般表示( )
In April, the weather in some places in Shanxi was really changeable. People still remember they have _______ four seasons in a week.
品读全文《鲸》,想一想课文用了哪些说明方法?
材料一:
为了消除漫画《十面“霾”伏》所反映的现象,使人们呼吸到清新洁净的空气,我们必须( )