We all know that the earth is not the c________ of the universe(宇宙).

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閱讀理解。

Think about the different ways that people use the wind. You can use it to fly a kite or to sail a boat. Wind is one of our cleanest and richest power sources, as well as one of the oldest. Something shows that windmills(風(fēng)車) began to be used in ancient Iran back in the seventh century BC. They were first introduced to Europe during the 1100s, when armies returned from the Middle East with knowledge of using wind power.

For many centuries, people used windmills to make wheat into flour(面粉) or get water from deep underground. When electricity was discovered in the late 1800s, people living in faraway areas began to use them to produce electricity. This allowed them to have electric lights and radio. However, by the 1940s when electricity was available to people in almost all areas of the United States, windmills were hardly used.

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D. To help dig wells in faraway areas.

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C. In the 1970s D. In the 1800s

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C. Because it’s cleaner than other sources.

D. Because it could only be used in faraway areas.

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