问题
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阅读材料,回答题。 NanotechnologyMany of the grand challenges of today and the future are
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The grand building was______to ruins in one night because of the earthquake.A.reducedB.cas
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______ is NOT a tourist attraction in the United States.A.Yellowstone National ParkB.Grand
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What does the word "distant-horizon" in Paragraph Two mean?A.Far-reaching.B.Remote.C.Grand
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______forms a natural boundary between Mexico and the United States.A.The Rio Grande River
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You visit the Grand Canyon and take beautiful photos with a______(2 words).