题目内容

--______ does your Chinese teacher look like?She is tall and thin.

A. Which
B. Where
C. When
D. What

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Advice will be valueless (毫无价值的) _______ it is accepted.

A. unless
B. and
C. or
D. since

My English teacher has given us some ______ on how to study English well.

A. stories
B. suggestions
C. messages
D. practice

My mother and my aunt are both ______. They work in a big supermarket.

A. actresses
B. doctors
C. salesmen
D. saleswomen

钙和磷在体内主要分布在中，血钙按其是否可以自由通过毛细血管壁，可以被分为和，后者一部分是与小分子柠檬酸结合成的钙盐，还有一部分呈游离状态的直接发挥着生理功能，占到总血钙的 %。