资料分析法的优点是什么？

骨中之骨，肉中之肉

阅读下面的短文，并根据短文后的要求答题(请注意问题后的字数要求)。

What is the hottest topic at your school recently? In Hangzhou Yongjin Middle School, it’ s money.

The school held an activity called “making money” last weekend. About 200 Junior 1 and Junior 2 students were divided into 30 teams. They went out ___________________________. What did they choose to sell? Some sold newspapers；some chose bottled water；some sold environmentally friendly shopping bags and bamboo baskets.

Hu Qing’ s team decided to sell some useful books in front of the Children Activity Center. They thought parents would like to buy the books for their children. But unfortunately, they met urban management officers. The officers asked them to leave. “We played hide-and-seek with the offices for the whole morning,” said Hu. “Finally we had to give up.”

Wang Bing and her team sold ice cream in a square. They didn’ t meet any officers. But few people were interested in what they were selling. The team then put up a board saying “For Country Kids”. It worked. More people came to their stall（小摊）. A foreigner even gave them 100 Yuan. “He didn’ t want any change. He said he wanted to help the children,” said Wang. “We were touched.” Later that day they gave the 100 Yuan and more to the “Project Hope” office.

Meng Zhaoxiang and his team were luckier. They sold all their cakes in four hours, spending 39.5 Yuan and getting back 80 Yuan. They made 40.5 Yuan. “It was not easy to make the money,” said Meng. “Some people just looked. Others just tasted but didn’ t buy. Now I know how hard it is for our parents to make money we need to lead happy lives. ”

小题1:What is the main idea of the text?(No more than ten words)

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小题2:Fill in the blank in Paragraph 2 with proper words. (No more than ten words)

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小题3:What does the underlined “it” in Paragraph 4 refer to?

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小题4:What is the writer’ s attitude towards the activity?

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小题5:What is the purpose of holding the activity? (No more than twelve words)

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设乙在回家的路上碰到昔日的同学丙，丙正急需一台笔记本电脑而苦于无处购买，乙即将该电脑卖给丙，并约定由丙向甲付款。丙届时未付款，则以下表述正确的是()。

A．乙无权处分，丙也知情，如甲不予追认并想收回电脑，可直接向丙索要

B．丙届时未按约付款，应向甲承担违约责任

C．丙届时未付款，应由乙向甲承担违约责任

D．甲与乙是一个买卖关系，乙与丙是另一个买卖关系，丙只能向乙付款，乙再向甲付款

RandomAccessFile所实现的接口是 【9】 。

试述工程观测与试验工作的基本要求？