正确答案: D

A和B

题目：杜仲的花为( )。

解析：D

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[单选题]______________________________________________________________________________Unabridged dictionaries contain as many as 500,000 entries and provide detailed definitions and extensive word histories (etymologies). These dictionaries, possibly in several volumes and mostly found in libraries, are excellent sources for scholarly inquiries. Unabridged dictionaries include the Oxford English Dictionary and the Random House Dictionary of the English Language.

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[单选题]科学的研究方法是取得成功的关键。下列关于人类探索遗传奥秘历程中的科学实验方法及技术的叙述，不正确的是 （ ）

格里菲思利用肺炎双球菌研究遗传物质时，运用了放射性同位素标记法