摘要:2010年高考题 Passage 1 Have you ever wondered?1. Why do airplanes take longer to fly west than east? It can take five hours to go west-east from New York(NY) to London bur seven hours to travel east-west from London to NY. The reason for the difference is an atmospheric phenomenon known as the jet stream. The jet stream is a very high altitude wind which always blows from the west to the east across the Atlantic. The planes moving at a constant air speed thus go faster in the west-east direction when they are moving with the wind than in the opposite direction.

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