问题
单项选择题
According to the passage, all the following are easier to synthesize EXCEPT ______
A．aromatic ingredient in vanilla
B．vanilla
C．aromatic ingredient in wild cherry
D．the flavor of fresh coffee
答案
参考答案：D
解析：[分析] 细节题型。 本题可用排除法。见第二段第一句：Some natural fragrances are easily synthesized； these include vanillin，the aromatic ingredient in vanilla，and benzaldehyde，the aromatic ingredient in wild cherries．选项A、B、C的内容均被提及，因此除外的选项只有D，所以D为答案。(本题答案也可用下一题的推断法推出)