东西半球的分界线是( )
A:赤道
B:20°E 160°W
C:20°W 160°E
D:0°180°
—You went out and enjoyed yourself when you________.
—I'm sorry,Mum. I'll finish my homework tonight.
正常情况下,人体从肾脏流出的血液成分与流入肾脏的血液成分相比,其特点是( )
下列依次排列的四幅植被景观图反映了我国:( )