Pine trees,of which there are almost one hundred --,are foun

问题描述：

Pine trees,of which there are almost one hundred __,are found throughout the North
Temperate Zone
A.species B.samples C.specimens D.standards
1个回答 分类：英语 2014-09-25

问题解答：

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A
松树有一百多种.A,生物物种、种类；B,样本,采样；C,试样,样本；D, 标准
 
 
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