实验桌上放着晶体二极管、电阻、电容器各一只，性能均正常，外形十分相似.现将多用电表转换开关拨到×挡，分别测它们的正负电阻加以鉴别：测甲元件时，；测乙元件时，，；测丙元件时，开始指针偏转到，接着读数逐渐增大，最后停在上.则甲、乙、丙三个元件分别是(   )

A．电容、电阻、二极管

B．电阻、电容、二极管

C．电阻、二极管、电容

D．二极管、电阻、电容

用所给单词的适当形式填空。

1. Her room _____ (clean) every day.

2. His new clothes _____ (buy) the day before yester day.

3. This question _____ (discuss) next meeting.

4. The blackboard newspaper of our class _____ (often change)．

5. A new library _____ (built) in our school last year.

6. The supermarket _____ (close) this Saturday.