末次月经第1天是1997年10月27日，计算预产期是A．1998年7月30日 B．1

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问题单项选择题

末次月经第1天是1997年10月27日，计算预产期是

A．1998年7月30日

B．1998年7月31日

C．1998年8月1日

D．1998年8月2日

E．1998年8月3日

答案

参考答案：E

多选题

根据句意及首字母或汉语提示完成句子。

1. T _____ the problem was very difficult, they didn't give up and succeeded in the end.

2. It's very important to get e _____ sleep every day to keep healthy.

3. Tom moved to China in 2006. He has found many differences b _____ Chinese and American.

4. The old photo often r _____ me of my childhood an my playmates.

5. —What's the matter with Gina?

—She's s _____ out.

6. Don't f _____ the animals when you are in the zoo. It's not good for the animals.

7. Could you please give me some a _____ on how to learn English well?

8. The heavy earthquake h _____ in Wenchuan on May 12th 2008.

9. When Zhou Jielun appeared on the state, the f _____ of his all stood up and clapped their hands.

10. S _____ is the best season of a year. When it comes, the trees turns green.

单项选择题

用树形结构来表示实体之间联系的模型称为

A．关系模型

B．层次模型

C．网状模型

D．数据模型