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需求分析的任务是通过调查、收集与分析，获得用户对数据库的信息要求、___和安全性与完整性要求。

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局部E-R模型的集成，无论采用哪种集成法，每一次集成都分为两个阶段：第一步是合并，第二步是___。

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局部E-R模型的集成，由局部E-R图生成初步E-R图时，需要消除各局部E-R图之间的___情况。

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Section A News reportDirections: In this section, you will hear two news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.News report (20181201N1)[音频]Question 1 is based on the news report you have just heard.

A. Land a space vehicle on the moon in 2019.
B. Design a new generation of mobile phones.
C. Set up a mobile phone network on the moon.
D. Gather data from the moon with a tiny device.

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Question 2 is based on the news report you have just heard.

A. It is stable.
B. It is durable.
C. It is inexpensive.
D. It is sophisticated.

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