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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 4
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A.A. Ambergris, a waxy, sweet-smelling substance that comes from sperm whales, is a key ingredient in some perfumes.
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B.A. There are various animal products used in the production of perfumes.
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C.A. Musk from the male musk deer is added to perfumes and men's colognes.
B显示答案
