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课后练习：
1. encounterin the next 1,000 years?
A. What problems will our world B.What problems our world will
2. The production of grain mainly because of climate changes.
A. seems to be decreased B.seems to be decreasing
C. seems to decrease D.seems to is decreasing
3. Natural disasters like storms and floods have washed amany crops.
A. away B. out C. in D. to
4. With less land for cattle and sheep, less meat like beef andlamb .
A. are being produced B.is producing
C. is being produced D.is produced
5.However, the paper-making process unfortunately damagesthe planet it uses large amounts of water, burns fossilfuels and produces large amounts of chemical waste.
A. as B. so C.if D. with
6. Automobile production is down, bicycle production is up.
A. which B. while C. where D.when
7.The third major trend is toward an attitude of .
A.difference B. indifferent C. indifference D. different
8.These challenges showthat all of us solving the problems.
A.need to are involved in B.need to be involved
C.needs to be involved in A.need to be involved in
关于本课的两点说明：
在做“阅读理解题”时，需要特别注意but, however,while, although等“转折连词”，理解它们前、后句子所要表达的意思。
as在本课中出现了几种不同用法，as可是考试中的“大热门”。
conj.(连词)：因为；随着；虽然；当…时
As（随着）the number of women going to school increases, the growth rate declines. (第5段)
As（随着）countries around the world trade more with one another, more products areavailable. (第15段)
However, the paper-making processunfortunately damagesthe planetas（因为）it uses large amounts of water, burns fossil fuels and produces large amountsof chemical waste. (第15段)
Three major health trends existas（当…时候）we begin the new century. (第18段)
prep.(介词)：当作；如同；以…身份
To understand a country’seconomy, economists check growth in an industrysuch as（比如）steel. (第2段)
While natural gas useis increasing，use of coalas fuel(作为燃料)is decreasing.(第13段)
