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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 3
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A.A. Hair performs important functions for the human body.
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B.A. Eyebrow hairs block the glare of the sun and help keep sweat from the eyes.
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C.A. Nasal hair traps harmful dust particles and prevents them from reaching the lungs.
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