C. Potassium intake is more beneficial to those without high blood pressure.
D. There was not any association between potassium intake and ischemic strokes.
【解析】选C。推理判断题。根据第三段中研究结果可知。
7. It can be learned from the passage that______.
A. results of the research were based on potassium from medicine
B. researchers gave different amounts of potassium to the elderly women
C. elderly women need to keep a balance between sodium and potassium intake
D. the effects of potassium intake on men and younger women are not yet known
【解析】选D。细节理解题。根据文章最后一句话Researchers said more studies are needed to determine whether potassium has the same effects on men and younger women. 可知。
8. The author’s purpose for writing this passage is to______.
A. present a report on a new research
B. show the importance of a good lifestyle
C. give information about a chemical element
D. encourage elderly women to take potassium
【解析】选A。主旨大意题。作者写这篇文章就是告诉人们一个新的科学调查。
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