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글의 흐름으로 보아, 주어진 문장이 들어가기에 가장 적절한 곳은?
Nowadays, it is much easier to find out where you are and which way to go because you have one of the world's greatest inventions at your fingertips.

For thousands of years, humans had difficulty trying to figure out where they were. ( ① ) So, they devoted a great
deal of time and effort to resolving this problem. ( ② ) They drew complicated maps, constructed great landmarks to keep themselves on the right path, and even learned to navigate by looking up at the stars. ( ③ ) As long as you have a Global Positioning System(GPS) receiver, you never have to worry about taking a wrong turn. ( ④ ) Your GPS receiver can tell you your exact location and give you directions to wherever you need to go, no matter where you are on the planet!

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