问题
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A.Because there was a shortage of men and women in the area.B.Because mining communiti
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The most popular product(s)at Googles developer conference in San Francisco was/were______
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Last year, the death toll in Chiles mines was______.A.33B.45C.72D.90
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What can we learn about the population of San Francisco?A.There was about ten thousand peo
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What happened in 1869 in San Francisco, according to the passage?A.Gold was discovered in
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Last year, the Kensington mine in Alaska was permitted to dispose over toxic mine waste di