D. The central and southern areas of Germany are rich in wind energy.

　　6. What percentage of Germany’s electricity was generated by wind in 2017? _____.

　　A. 11%

　　B. 22%

　　C. 50%

　　D. 60%

　　7. What is the main idea of the passage? _____.

　　A. Wind parks are increasing rapidly all over Germany.

　　B. The Rheinhardswald is famous for the tales of Sleeping Beauty.

　　C. Expanding wind energy into the land of Sleeping Beauty causes controversy.

　　D. Building wind turbines in the land of Sleeping Beauty area makes no sense.

　　C

　　It remains a curiosity and a bit of a historical mystery why we don't all drive on the same side of the road. The fact is that most people are right-handed; that's why, for much of history, drivers have stuck to the left. Ancient Romans using two-wheeled carriages are believed to have held the reins(缰绳) with their right hands and a whip with their left; to avoid whipping the near drivers, they favored the left-hand side the road. It's also easier for right-handers to get on a horse from the left, so riders were attracted to that side to avoid the near traffic as they climbed on and off. Finally, knights(骑士) and the other drivers favored the left so they could do battle, if necessary, with their good hand.

　　So why does most of the world travel on the right side today? Theories differ, but there's no doubt Napoleon was a major influence. The French have used the right since the late 18th century.

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