In opposing the 1970 Clean Air Act, the United States automobile industry argued that meeting the acts standards for automobile emissions was neither economically feasible nor environmentally necessary. However, the catalytic converter, invented in 1967, enable automakers to meet the 1970 standards efficiently. Currently, automakers are lobbying against the governments attempt to pass legislation that would tighten restrictions on automobile emissions. The automakers contend that these new restrictions would be overly expensive and unnecessary to efforts to curb air pollution. Clearly, the automobile industrys position should not be heeded. Which one of the following, if true, lends the most support to the automakers current position？
A. The more stringent the legislation restricting emissions becomes, the more difficult it becomes for automakers to provide the required technology economically.
B. Emissions-restriction technology can often be engineered so as to avoid reducing the efficiency with which an automobile uses fuel.
C. Not every new piece of legislation restricting emissions requires new automotive technology in order for automakers to comply with it.
D. The more automobiles there are on the road, the more stringent emission restrictions must be to prevent increased overall air pollution.
E. Unless forced to do so by the government, automakers rarely make changes in automotive technology that is not related to profitability.
If the airspace around centrally located airports were restricted to commercial airliners
A. Commercial airliners are already required by law to be equipped with extremely sophisticated radar systems.
B. Centrally located airports are experiencing overcrowded airspace primarily because of sharp increases in commercial-airline traffic.
C. Many pilots of private planes would rather buy radar equipment than be excluded from centrally located airports.
D. The number of midair collisions that occur near centrally located airports has decreased in recent years.
E. Private planes not equipped with radar systems cause a disproportionately large number of midair collisions around centrally located airports.
Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on
A. There are more common characteristics than there are differences among the bower-building styles of the local bowerbird population that has been studied most extensively.
B. Young male bowerbirds are inept at bower-building and apparently spend years watching their elders before becoming accomplished in the local bower style.
C. The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.
D. Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.
E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.
在防火墙日常维护工作中，下列哪项任务不必经常进行（）。
A. 备份防火墙
B. 适当改变防火墙过滤规则
C. 进行帐户管理
D. 进行磁盘空间管理
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