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Biologically, there is one quality that distinguishes us from animals; the ability to laug
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Being easily set on fire, alcohol must be kept away from the flame.A、酒精容易着火，必须放
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_____the rain and the wind, he came on time.A. Apart fromB. In spite ofC. Although
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They keep telling us that it is vital that we ______there on time.A．areB．beC．must beD．woul
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The worlds population continues to grow. There now are about 4 billion of us on the earth
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There have been great changes in the country() you visited us last time.
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The world’s population continues to grow. There now are about 4 billion of us on earth
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