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    Pine trees, of which there are almost one hundred ____, are found throughout the North Temperate Zone.
    A．speciesB．samplesC．specimensD．Standards
    A
    词义辨析。  A. 物种；种类 B. 样品   C. 式样；样本 D. 标准；规格。句意：在北温带发现将近有100种松树。这里是指植物的物种，故选A。
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