Pine trees, of which them am almost one hundred ______, are found throughout the

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问题 Pine trees, of which them am almost one hundred ______, are found throughout the North Temperate Zone.

选项 A、species
B、differences
C、similarities
D、standards

答案 A

解析 species[生物]种(屑以下的分类法)；differences不同之处，不同点；similarities类似之处，相似点； standard标准，水准；句意：在整个北温带地区，大约可以找到100种松树。

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