A:①②③
B:②③④
C:①③④
D:①②③④
一艘科学考察船计划9月份从A点(20°N,20°E)出发,到达与A点纬度相同,经线正好相对的B点进行科学考察,则B点的经度是( )
— I'm afraid I can't finish the task in such a short time.
— Don't worry. Can you finish it if you two more days?