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问题 选择题

. Leaves are found on all kinds of trees, but they differ greatly ________ size and shape.

A．on

B．from

C．by

D．in

答案

答案：D

介词的用法。介词in表示“在......方面。句意：“人们发现树上长着各种各样的叶子，但它们的大小、形状大不相同。differ from与…..不同，与本题题意符合。

材料分析题

我国居民的恩格尔系数(单位：%)

（注：根据联合国粮农组织的划分标准，恩格尔系数在60%以上的为绝对贫困，50%～60%的为温饱，40%～50%为小康，30%～40%为富裕。) 

请运用所学的经济学知识回答：

（1）上述表格反映了什么经济现象？

                                                                                                                                                              

                                                                                                                                                              

（2）为解决上述经济问题提几点建议。

                                                                                                                                                             

                                                                                                                                                              
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问答题

Today concern for the environment extends into such areas as chemical pollution of the air we breathe and the water we drink, strip mining, dam and road building, noise pollution, offshore oil drilling, nuclear energy, waste disposal, the use of aerosol cans and nonreturnable beverage containers and a host of other issues. In fact, there is hardly a realm of national life that is not touched by the controversy that often pits those" who style themselves environmentalists against proponents of economic growth in our energy-consuming society. The problem is to balance the needs of the environment against those of the economy or consumers trying to cope with the high cost of living without destroying the earth on which we all depend. In this sense, it is important how nations should go about making environmental policies choice. Public awareness education on environment should be enhanced among citizens.
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