4、保护土地资源，是每个公民应尽义务，也是造福子孙后代的需要。

Dear Li Hua,

How are you? With this letter I'd like to introduce my hometown-Jiangsu Province to you．

3、人们正认识到保护耕地的重要性，政府积极采取措施禁止非法用地。

2、随着经济的发展和人口的增长，越来越多的良田被征用来建造住房和工厂。耕地面积逐年减少。

1、江苏是我国经济发达的省份之一，位于我国的东部，人口多，耕地少。

人口：7000多万；土地面积：10多万平方公里。自然资源贫乏。

69.Which of the following is NOT mentioned as an environmental factor that affects IQ 　　　.

　　　 A．Good nutrition．　　　　　　　　　　　　　　　　 B．Improved technology.

　　　 C．Better education．　　　　　　　　　　　　　　　 D．Food pollution.

68.The author is in favor of _____________ according to the passage.

　　　 A．putting retarded children into institutions

　　　 B．providing early childhood education programs

　　　 C．keeping children in orphanages

　　　 D．keeping retarded children with others like themselves

67.What's the main idea of this passage

　　　 A．Retarded children cannot improve their IQ's.

　　　 B．Orphanages are full of mentally retarded children.

　　　 C．Environmental factors influence a child's IQ.

　　　 D．Early childhood education programs are important.

66．What did they these teenagers learn from the journey?

　　　 A．It was high time that people protected the environment.

　　　 B．Long journey was not suitable for school children.

　　　 C．It should take the whole world to help the children.

　　　 D．Environmental problems can be solved if school children take part.

D

　　　 How much can environment affect intelligence? In one study, striking increases in IQ occurred

in 25 children who were moved from an orphanage(孤儿院) to more stimulating(使人兴奋的，使人振奋的) environments．The children, who were all considered mentally retarded and unadoptable, were moved to an institution where they received personal attention from adults．Later, these supposedly retarded children were adopted by parents who gave them love, a family ,and a stimulating home environment．The children gained an average of 29 IQ points．For one child, the increase was an amazing 58 points．A second group of initially less "retarded" children, who stayed in the orphanage, lost an average of 26 IQ points.

　　　 Other encouraging results can be found in early childhood education programs, which provide

stimulating intellectual experiences for disadvantaged children．In one study, children from low-income families were given enriched environments from early infancy(婴儿期) through preschool．By age 2 their IQ scores were already higher than those in a control group．More important, they were still 5 points higher seven years later．High-quality enrichment programs such as Head Start can prevent children from falling behind in school.

　　　 A particularly striking environmental effect is the fact that 14 nations have shown average IQ

gains of from 5 to 25 points during the last 30 years．These IQ boosts, averaging 15 points, occurred in far too short a time for genetics to explain them．It is more likely that the gains reflect environmental forces, such as improved education, nutrition, and living in a technologically complex society.

65．It can be inferred that Earthwatch Institute could be _____．

　　　 A．an international university that takes in students from all over the world

　　　 B．a TV station that makes programmes on the beautiful scenery of the earth

　　　 C．a travel agency that organizes adventure trips specially for school children

　　　 D．an organization that brings science to life for people concerned about the earth’s environment