单选题:According to the text, what has happened worldwide in the la

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题目内容:
According to the text, what has happened worldwide in the last three decades and seven years ? A.Populations of species have fallen by 60 percent.
B.Human demands on natural resources have doubled.
C.Populations of species have declined by 30 percent.
D.Our lifestyles have used up 1.5 planets' resources.

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