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第1题

The most important use of drifting (漂流) bottles is to find ocean currents. When the position and direction of currents a
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第2题

Sixteen years ago I learned this lesson in the back of a New York City taxi cab．Here’s what happened．I hopped in a taxi,
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第3题

Long before the first Europeans arrived in America, a strange looking animal lived on the western plains. It looked some
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第4题

Alexander Graham Bell was born in Edinburgh, Scotland on March 3, 1847. When he was only eleven years old, he invented a
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