建筑工程施工质量验收统一标准（GB50300-2001）：分项工程质量验收合格应符合

由SO₂、SO₃组成的混合气体，经分析混合气体中硫元素的质量分数为48%，则混合气体中的SO₂、SO₃质量比为（　　）

A．6：5

B．4：1

C．4：5

D．无法确定

“Creativity is the key to a brighter future,” says education and business experts. Here is how schools and parents can encourage this important skill in children.

If Dick Drew had listened to his boss in 1925, we might not have a product that we now think of as of great importance: a new type of tape. Drew worked for the Minnesota Mining Company. At work he developed a kind of material strong enough to hold things together. But his boss told him not to think more about the idea. Finally, using his own time, Drew improved the tape, which now is used everywhere by many people. And his former company learned from its mistake. Now it encourages people to spend 15 percent of their work time just thinking about and developing new ideas.   

Creativity is not something one is just born with, nor is it necessarily a character of high intelligence. The fact that a person is highly intelligent does not mean that he uses it creatively. Creativity is the matter of using the resources one has to produce new ideas that are good for something.

Unfortunately, schools have not tried to encourage creativity. With strong attention to test results and the development of reading, writing and mathematical skills, many educators give up creativity for correct answers. The result is that children can give back information but can’t recognize ways to use it in new situations. They may know the rules correctly but they are unable to use them to work out practical problems.

It is important to give children choices. From the earliest age, children should be allowed to make decisions and understand their results. Even if it’s choosing between two food items for lunch, decision-making helps thinking skills. As children grow older, parents should let their children decide how to use their time or spend their money. This is because the most important character of creative people is a very strong desire to find a way out of trouble.

小题1: What did the company where Drew once worked learn from its mistake?

A．They should encourage people to work a longer time.

B．People should be discouraged to think freely.

C．People will do better if they spend most of their work time developing new ideas.

D．It is necessary for people to spend some of their work time considering and improving new ideas. 小题2:According to the passage, creativity is ________.

A．something that most people are born with

B．something that depends mainly on intelligence

C．a way of using what one has learned to work out new problems

D．something that is not important to the character of a person at all小题3:Why do schools tend to fail to encourage creativity?

A．They give children too many choices.

B．They are not strict enough with children.

C．They care too much about examination marks.

D．They don’t understand the importance of education.小题4:Which of the following skills is the most important in developing creativity?

A．Reading.

B．Writing.

C．Mathematical skill.

D．Decision-making.

下面哪些措施对预防病毒是无效的______。

A．专机专用

B．定期检查

C．建立备份

D．清除灰尘

《建设工程安全生产管理条例》规定，（）应当经建设行政主管部门或者其他有关部门考核合格后方可任职。

A.工会负责人

B.施工单位的主要负责人

C.项目负责人

D.专职安全生产管理人员

E.财务负责人

某产品1999～2003年的销售额与目标市场人均收入的数据见表2-2，2006年该产品的目标市场人均收人为1800元。

表2-2 1999～2003年产品销售额与目标市场人均收入

已知数据：1999～2003年各年产品销售额的平方和为6465；1999～2003年各年人均收入的平方和为7652500；1999～2003年各年人均收入与产品销售额乘积之和为222400。 相关系数临界值如表2-3所列。

表2-3 相关系数临界值

【问题】

1．建立一元线性回归模型(参数计算结果小数点后保留3位)。

2．进行相关系数检验(取α＝0.05，R值小数点后保留3位)。

3．对2006年可能的销售额进行点预测。