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问题 选择题

. She _____ on this essay for twenty minutes but she has written only about a hundred words.

A．will be working

B．worked

C．has been working

D．will have worked

答案

答案：C

填空题

数据的独立性分为逻辑独立性与物理独立性。当数据的存储结构改变时，其逻辑结构可以不变，因此，基于逻辑结构的应用程序不必修改，这称为______。
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句型转换

按要求转换下列句式，每空一词。

1. Peter has an interesting book. (改为一般疑问句)

_____ Peter_____ an interesting book?

2. Jenny likes milk for breakfast. (改为否定句)

Jenny_____ _____ milk for breakfast．

3. My new T-shirt is white. (对划线部分提问)

_____ is your new T-shirt?  

4. What’s the price of the bag? (改为同义句)  

_____ _____ is the bag?

5. Can the boy play computer games?(作否定回答)

No, _____ _____.
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