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题目材料：
DIRECTION:
Each of the following groups of statements includes ONE main idea and two supporting details.
Please mark on the statement this is the main idea.
Group 6
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A.A. Most fad diets are nutritionally unbalanced and can cause headaches, nausea, and dizziness.
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B.A. Fad diets are often ineffective and can lead to physical problems.
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C.A. Metabolic changes caused by fad diets often lead to weight gain -- not weight loss.
B显示答案
