【单选题】()is the distance east or west measured in degrees,minutes and seconds of arc on the equator between the prime meridian and the meridian passing through the place.
【简答题】阅读理解。 The word 'day' has two meanings. When we talk about the number of days in a year, we are using 'day' to mean 24 hours. But when we talk about day and night, we are using 'day' to mean the time b...