Directions: In this section of the test, there are ten paragraphs. Each of the paragraphs is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Spell out the missing letters of the word on your Answer Sheet.
Paragraph Seven
Spinach may cause Alzheimer's disease in at-risk people, research suggests. The salad leaf's iron-rich content may damage the brain similar to how the compound causes metal to rust, according to the researchers. People with high levels of iron, which has previously been associated with Alzheimer's, are more likely to experience rapid cognitive decline, a study found.
Iron-rich v_____ may lead to Alzheimer's disease.
【正确答案】：vegetables
