by the promise of these tiny tubes, people are already working to turn the Space Elev

Traffic separation schemes may be （)by the Organization for the purpose of these Rules.

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According to the spokesman, a band of these tiny American discounters will be ______.A．pro

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Control of these emissions by adequate gas-cleaning processing is essential. The underline

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The Chinese are appalled by a series of incredible facts these days—a young man stabbed hi

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One of the African guides could tell that these nests had been abandoned by the goril

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The number of these families has increased by 40 percent in the past ten years.A.在过

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If you travel by air across the center of Africa or South America you fly over forests for thousands of kilometers. These great forests are the oceans of trees. There are thousands and thousands of d

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