生物价越高，说明蛋白质被机体利用率越高，即蛋白质的营养价值越高，生物价最高值为100。
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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（ ）
The main purpose of this article is to introduce us ___________.
A. the actual value of the A4 paper
B. the writer's hobbies
C. a Danish artist
D. the works of art created by a Danish artist
The writer loves paper. He loves _________________ of paper.
A. the smell
B. the look
C. the feel
D. the shape
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