What have scientists learned a great deal about? What green vegetable is not mentioned in the passage?

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问题 What have scientists learned a great deal about?
What green vegetable is not mentioned in the passage?

选项 A、Lettuces.
B、Peas.
C、Cabbages.
D、Spinach.

答案D

解析本题为细节判断题。根据第1段有关绿色蔬菜所给的例子可知本题答案为D。

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大学英语三级B级

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