Pine trees, of which there are almost one hundred ____, are found throughout the North Temperate Zone.
A．speciesB．samplesC．specimensD．Standards
A
詞義辨析。  A. 物種；種類 B. 樣品   C. 式樣；樣本 D. 標(biāo)準(zhǔn)；規(guī)格。句意：在北溫帶發(fā)現(xiàn)將近有100種松樹。這里是指植物的物種，故選A。
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