什么是冷加工强化和时效？各对钢材性能有何影响？

阅读理解

       US teenagers may be facing a challenge (挑战) today. A recent survey suggests (表明) that they

are less honest than previous generations (上一代人).

       The survey was done among 29,760 students at 100 US high schools. The results suggest that in

the past year, 30 percent of US high school students have stolen from a store. And 64 percent may

have cheated on a test.

       However, 93 percent of the students said they were satisfied (满意) with their honesty. And 77

percent said,"when it comes to doing what is right, I am better than most people I know."

Some teachers were unhappy about the survey results. Some,  however,  defended (为……辩护)

today's students.

       "The competition is greater and the pressures (压力) on kids have increased greatly,"said Mel

Riddle, who was a high school teacher and headmaster for 40 years."It is the pressures that make it

easy for students to be dishonest."

       "I think these students are better than other generations,"he said."I find them more active, better

to work with and more thankful for support."" We have to create situations where it's easy for kids to

do the right things, "he added."We need to create classrooms where learning is more important than

having the right answer."

1. According to the survey, what challenge do US teenagers face today? 

A. They have trouble getting pocket money      

B. They don't get along well with teachers

C. They are not so honest as older generations    

D. They have too many tests to take each week

2. We can learn from the survey that children in the US nowadays         .  

A. behave worse      

B. work harder      

C. are less healthy      

D. are busier at school

3. According to the survey results,        percent of the students are satisfied with their honesty. 

A. 30              

B. 64              

C. 77                

D. 93

4. What's Mel Riddle's opinion about the idea that students are dishonest?  

A. He gets really angry about it            

B. He thinks parents must do something to stop it

C. He thinks the students should change their behavior

D. He thinks there are some reasons for being dishonest

5. What advice does Mel Riddle give on improving the honesty of students?  

A. Do not let students do anything          

B. Make it easier for them to learn

C. Ask students to find right answers        

D. Give students more free time to have fun

传播材料的设计制作首先要确定的是（）

A.传播资料

B.传播方法

C.传播项目

D.传播目的

E.传播信息

通常房地产开发投资利润率的计算基数为( )。

A．土地取得成本+开发成本

B．土地取得成本+开发成本+管理费用

C．土地取得成本+开发成本+管理费用+销售费用

D．开发完成后的房地产价值

从细胞生物学角度解释为何食用三文鱼和大豆有利于健康？

布雷顿森林体系是以黄金为基础，但却是以美元为主要国际储备货币的国际货币体系，自此体系建立起来，金本位制度就宣告崩溃了。