Pine trees, of which there are almost one hundred , are found throughout the North Temperate Zone.
A. species
B. samples
C. specimens
D. Standards
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(答案→)A. species
B. samples
C. specimens
D. Standards
解析：词义辨析。 A. 物种；种类 B.样品 C. 试样；样本D. 标准。句意：在整个北温带发现的松树，几乎有一百个种类。这里指的是树的物种，故选A。