A:120°
B:30°或120°
C:60°
D:60°或120°
“都省握天下之机,十省分天下之治”,这反映出元朝在行政区划方面的重大创新是( )
When the man walked ______ the library, he found a cat at the corner.
下列实验操作中错误的是( )
10+7=( )