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. 試樣;樣本D. 標(biāo)準(zhǔn)。句意:在整個北溫帶發(fā)現(xiàn)的松樹,幾乎有一百個種類。這里指的是樹的物種,故選A。
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