A:①
B:②
C:③
D:④
读东、西两半球示意图,图中每两条经线之间的间隔的经度相同,判断下列说法正确的是( )
— I rang the bell for a long time last night, but no one opened the door.— Oh, the family __________ a party and they didn't hear the bell.
某地位于140°W,与它组成经线圈的经线是( )