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单选题 In 1867, when about 150 botanists met in Paris and agreed on some rules pertaining to plants, one of their basic rules was

A. all plants should be classified in kingdoms

B. all plants should be given an English name, in addition to a Latin name

C. works of Linnaeus should be used as the starting point for all scientific names of plants

D. all plants should have named varieties

E. Linnaeus' Latin phrase names should be the official names of plants

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