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The economic costs of noise to society are several. Airports are currently op
The economic costs of noise to society are several. Airports are currently op
游客
2023-09-14
54
管理
问题
The economic costs of noise to society are several. Airports are currently op-
erating at less than capacity because of noise regulations, which restrict their 【S1】______.
hours of operation. For instance, at Washington’s national airport no jet traffic is
allowed from 11 p. m. to 7 a. m. Other airports restrict the use of certain run-
ways. One estimated is that noise restrictions reduce possible airport use by 20 【S2】______.
percent. The profitable cargo trade is especially affected by night restrictions.
In the case of airports, jet engines may be modifying to reduce their noise lev-【S3】______.
el, or insulation (隔音) from air traffic noise may be provided by the purchasing 【S4】______.
of land around airports. It is estimated that $ 5.7 billion would be required to
equip all existing jet engines for noise control devices. However, 【S5】______.
consider the current state of the art, even taking this step will not reduce noise 【S6】______.
levels at all points to acceptable values. Some combination of methods is proba-
bly necessary.
If all aircraft are made quieter by existing methods, there would be a number 【S7】______.
of economic benefits. An increase in airport capacity would occur. Property val-
ues near airports might rise. Transportation costs to and from airports could be
increased since the airports now could be located closer to population centers. 【S8】______.
Much research still needs to be done on the economic aspects of noise re-
duction and noise effects. Although some of the effects of noise pollution are
known, more must be discovered about their effects on health, productivity, prop- 【S9】______.
erty values and the quality of life. Furthermore. the cost of noise pollution to the
economy as a whole needs to be investigated.
The public must be alert about the dangers and economic costs of noise poi- 【S10】______.
lution so that people may make intelligent choices and exert appropriate pres-
sures.
选项
答案
than→ —
解析
赘述。本句中虽然出现less,但后面没有被比较的部分,less用来修饰capacity,因此than需要去掉。
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