What is the main purpose of the study led by Dr. Bray?(本题2.5分)
A、 To prove how fats contribute to weight gain.
B、 To find out a proper diet for overweight people.
C、 To study the relationship between diet and heart disease.
D、 To study the relationship between protein and weight gain. √
出自：西安石油大学大学英语I（下）
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