According to this passage, a diet high in plant-based foods plays an important role in fighting all kinds of diseases. Investig

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问题 According to this passage, a diet high in plant-based foods plays an important role in fighting all kinds of diseases.
Investigators don’t ______ how many phytochemicals exist and how they work.

选项

答案know much about

解析 在本文的第一大部分(Cancer Fighters)的第八段中就提到:Investigators have only an inkling of how many phytochemicals exist and how they work。句中的“have only an inkling of”即指"don’t know much"。
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