问题
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Population growth is the sole factor that has widened the gap between developing and devel
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The amount of fluid friction or internal friction inherent in a mineral lubricating oil is
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Without the friction between their feet and the ground, people would never be able to wal
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What is the news item mainly talking about?A.Negotiations between developing and industria
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In the clash between environmentalists and developers, the Indians, ______ presence is in
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All of the following are the causes of food crisis EXCEPTA.the imbalance between developed