One gram of a certain health food contains 7 percent of the minimum daily requirement of vitamin E and 3 percent of the minimum daily requirement of vitamin A. If vitamin E and A are to be obtained from no other sourse, approximately how many grams of the health food must be eaten daily to provide at least the minimum daily requirement of both vitamins?
A. 3
B. 7
C. 10
D. 14
E. 33
答案是E
可是...
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