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It is difficult to say precisely how many species of insects there are on Earth, in part because it is often hard to distinguish between a separate species and a variety of one, but scientists who have to give an estimate usually place the number at around 950,000 unique species.

  • A

    and a variety of one, but scientists who have to give an estimate usually place

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  • B

    and a variety of them, with scientists having to give an estimate usually placing

    分析该选项
  • C

    and a variety of one, but scientists who give an estimate usually placed

    分析该选项
  • D

    or a variety of them, but scientists who have given an estimate usually placed

    分析该选项
  • E

    or a variety of them, but scientists who have an estimate to give usually placing

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正确答案: A

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