Seawalls constructed to protect beachfront buildings will not themselves eventually be damaged by storms and will not require, if they are to protect the buildings, expensive repair or replacement.
The conservation of beaches for future generations should be the overriding goal of shore management at ocean coasts.
Trying to protect beachfront buildings by constructing seawalls is counterproductive in the long run for an oceanfront community wishing to maintain itself as a beach resort.
8. A study found that 70 percent of children surveyed in 1970 had at one time had cavities, whereas only 50 percent of those surveyed in 1985 had ever had cavities. The researchers concluded that the level of dental disease in children had declined between 1970 and 1985. Which of the following, if true, would most seriously undermine the researchers conclusion presented above?
Cavities are the most common kind of dental disease to which children are subject.
The children surveyed came from a broad variety of income backgrounds.
The children surveyed were selected from among students of teachers cooperating with the researchers.
The accuracy of cavity detection techniques has improved dramatically since 1970.
The children surveyed in 1985 were younger on average than those surveyed in 1970.
9. David: Since attempting to preserve every species that is currently endangered is prohibitively expensive, the endangered species whose value to humanity is the greatest should be accorded the highest priority for preservation. Karen: Such a policy would he unsound because it is impossible to predict the future value of a species, nor is it always possible to assess the present value of species whose contributions to humanity, though significant, are indirect.
【GRE阅读逻辑练习题目(10)】相关文章:
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