单项选择题
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A.the equator B.a loxodromic curve C.a small circle D.a meridian
单项选择题 A plane perpendicular to the polar axis will never form what line on the Earth’s surface? （）
单项选择题 A parallel of latitude other than the equator is a（）.
单项选择题 A nun buoy will（）.
