Which of the following descriptions of Lina Shu (舒丽娜) is true?
A. She is shy and says little to her friends.
B. She talks a lot and she is fun to be around.
C. She loves to listen to her friends rather than talk with them.
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20.纳米材料是指材料的显微结构尺寸均小于 ______ ，且具有某些特殊功能的材料。
19.热力学中强度性质，是指一些状态函数，如温度、密度等不具有______ 的性质。
18.单糖在水溶液中形成半缩醛环状结构，即成呋喃糖和 ______ 。
17.糖类、 ______ 、蛋白质、脂质——生命活动所必需的四大类化合物。
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