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30.Sheep on a remote Scottish island are gradually shrinking _______ global warming, according to a study published in the journal Science.

A. on account of      B. by means of       C. in case of         D. in spite of

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29.As is _______ known, a good knowledge of basic physics helps us better understand natural phynomenons.

  A. universally      B. specifically     C. adequately     D. completely

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