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最理想的膳食构成中多饱和脂肪酸、单不饱和脂肪酸和多不饱和脂肪酸三者之间的比例为（ ）
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The main purpose of this article is to introduce us ___________.
The writer loves paper. He loves _________________ of paper.
_____________ and ________________ are the key elements to paper cutting.
Peter Callesen cut the ordinary paper into extraodinary by means of ___________.
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