Pair Work
Work with a partner and try a Map Info Gap activity. Look at a map of your city. Choose a starting point. Now choose a building, but don't tell your partner which building you selected. Describe the location of your building using prepositions of place. Can your partner guess the building? Reverse roles.
与一名同伴一起进行Map Info Gap的活动。看一张你生活的城市的地图并在上面选择一个起点，然后选择一个建筑物，但是不要告诉同伴你的选择。用表示地点的介词描述你选择的建筑的位置。你的同伴能猜出这个建筑吗？交换角色练习。
Please finish this practice according to the following strategy. 你可以按照下面的策略来完成这个练习。
Before maps came into use, how did seafarers explore unknown places and not get lost at sea? In the Middle East, the ancient Phoenicians used the sun and the stars as their guides. In Northern Europe, where clear skies were less reliable, the Vikings watched the behavior of birds. As well as studying the flight paths of birds, the Polynesians studied the direction and type of waves to help them to navigate around the vast southern Pacific Ocean.
在地图出现之前，航海家们是如何开发未知的地方而不会在海上迷路呢？在中东，古代的腓尼基人用太阳和星星做向导。在北欧，清澈的天空有时不是那么可靠，维京人通过观察鸟类活动来判断方向。除了通过判断鸟类的飞行路线，波利尼西亚人还通过研究波浪的方向和种类来帮助他们在广阔的南太平洋航行。
Today's travelers can rely on the modern invention of GPS, Global Positioning System. This satellite navigation system can provide information on longitude, latitude, and altitude in any weather, day or night, anywhere on Earth.
今天的旅行者可以依靠现代的发明GPS，即“全球定位系统”。这种卫星导航系统可以提供地球上的任何天气、任何时间、任何地点的经度、纬度和高度的信息。
