题目

—I hear your grandpa has an old cup in your home.         —Yes. It ______ drinking tea long ago and my grandpa _____ drink tea with it when he was young. A. was used for; was used to    B. used to; was used to    C. was used for; used to 答案：C3．人体某些组织的含水量近似相等，但形态却不相同．例如，心肌含水量约79%，呈坚韧的固态；血液含水量约82%，却呈流动的液态．对这种差异的解释是（　　）A．心肌内结合水相对含量高B．血液中全是结合水C．心肌内都是自由水D．血液中全是自由水