A. Scientists are certain what exact results gene modification leads to.

　　B. Gene modification can benefit some farm animals and agricultural plants.

　　C. Scientists won't modify any genes before they make the final decision.

　　D. Gene modification will be encouraged in more creatures in the near future.

　　60. The article is mainly intended to ______.

　　A. appeal against research on gene control

　　B. show how to change genetic structure

　　C. inform us of power and danger of gene control

　　D. give the reason why gene modification is necessary

　　C

　　Elderly women who eat foods higher in potassium（钾）are less likely to have strokes and die than women who eat less potassium-rich foods, according to new research in the American Heart Association. “Previous studies have shown that potassium consumption may lower blood pressure. But whether potassium intake could prevent stroke or death wasn抰 clear,?said Smoller, professor of the department of population health at Albert Einstein College of Medicine, Bronx, NY.

　　Researchers studied 90,137 women, aged from 5ay0 to 79 for an average 11 years. They looked at how much potassium the women consumed, as well as if they had strokes, including ischemic strokes （缺血性中风）, or died during the study period. Women in the study were stroke-free at the start and their average dietary potassium intake was 2,611 mg/day. Results of this study are based on potassium from food, not supplements.

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