19．A.imagination

　　B．fortune

　　C．wildness

　　D．solution

　　答案：C　imagination意为“想象力”；fortune意为“财富，运气”；wildness意为“野外风景”；solution意为“解决办法”。文章全文都是在呼吁孩子要走出家门，走进自然，看野外风景，故C项正确。

　　20．A.senses

　　B．voices

　　C．features

　　D．smells

　　答案：D　根据此空前的sights，sounds可知此处应该用smells，表示户外的“清新气息”，故D项正确。

　　.阅读理解

　　Two American scientists told the people in industrial nations that they would be much healthier if they ate more of the same kind of food eaten by humans living more than 10,000 years ago.

　　The scientists say that the human body has changed very little since human first appeared on earth, but the way we live has changed greatly. Our body has not been able to deal with these changes in lifestyle and this has led to new kinds of sicknesses. These new sicknesses were not known in ancient times. So they are called “diseases of civilization (文明)”. Many cancers and diseases of the blood system ，including heart attacks and strokes(中风)are examples of such diseases.

　　Scientists noted that early stone­age people used very little alcohol (酒精)or tobacco, probably none. Ancient people also got a great deal of physical exercise，but a change in food is one of the main differences between life in ancient times and life today.

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