For many people in the United States who are concerned about the cost of heating homes and
For many people in the United States who are concerned about the cost of heating homes and businesses, wood has become an alternative energy source to coal, oil, and gas. Nevertheless, wood will never supply more than a modest fraction of our continuing energy needs. Which of the following, if true, does NOT support the claim made in the last sentence in the passage above？
A．There are many competing uses for a finite supply of wood, and suppliers give the lumber and paper industries a higher priority than they give individual consumers.
B．Wood produces thick smoke in burning, and its extensive use in densely populated cities would violate federal antipollution guidelines.
C．There are relatively narrow limits to how far wood can be trucked before it becomes more economical to burn the gasoline used for transportation instead of the wood.
D．Most apartment dwellers do not have adequate storage space for the amount of wood necessary to supply energy for heating.
E．Most commercial users of energy are located within range of a wood supply, and two-thirds of United States homes are located outside of metropolitan areas.
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参考答案；(A)表明个人消费者在有限的木材供应中能得到的份额相当少，起到了支持作用；(B)木材燃烧产生的浓烟限制了木材的使用范围，起支持作用；(C)说明当燃烧石油比燃烧木材更经济时，木材被使用的范围将爱限制，支持了文中最后一句话的观点；(D)说明贮藏木材需要的较大的空间限制了木材在居民中的广泛使用，所以(D)也起支持作用。