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- 精华
- 0
- 积分
- 1120
- 经验
- 1120 点
- 威望
- 111 点
- 金钱
- 111 ￥
- 魅力
- 111
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GWD 18 逻辑
28: GWD-29-Q9
Manatees, aquatic mammals inhabiting Florida’s rivers and coastal waters, swim close to the surface and are frequently killed in collisions with boats. To address the problem, boat traffic in manatee-populated waters is being required to maintain very low speeds. Unfortunately, manatees are unable to hear low-pitched sounds and a boat’s sound lowers in pitch as the boat slows. Therefore, this approach may in fact make things worse rather than better.
Which of the following, if true, casts most doubt on the conclusion? E
A. The areas where boats would have to maintain low speeds were decided partly on the basis of manatee-population estimates and partly from numbers of reported collisions between manatees and boats.
B. Because the water hyacinth that manatees feed on grows best in water that is nearly still, water hyacinth beds can be disturbed or damaged by fast-moving boat traffic.
C. Over the last several decades, boat traffic in Florida’s coastal waters has been increasing almost continuously and now represents the greatest threat to the endangered manatee population.
D. The sound of a boat engine generally travels much further under water than it does through the air.
E. When experimenters exposed manatees to the recorded sounds of boats moving at various speeds, the creatures were unable to discern the sounds over normal background noise.
这题为什么不能选B？
9. GWD27-Q9:
In order to raise revenue, the federal government planned a tax amnesty program that allows tax delinquents to pay all owed tax without added financial penalty. However, economists projected that the federal government would collect a far lower percentage of total tax owed by delinquents than did state governments implementing similar programs.
Which of the following, if true, would most contribute to an explanation of the economists’ projections? E
A. Tax amnesty programs are only successful if they are widely publicized.
B. Most people who honestly pay their state tax are equally honest in paying their federal tax.
C. Although federal tax delinquents usually must pay high financial penalties, the states require far lower financial penalties.
D. The state tax rate varies considerably from state to state, but the federal tax is levied according to laws which apply to citizens of all the states.
E. Unlike most federal tax delinquents, most state tax delinquents fail to pay state tax because of an oversight rather than a decision not to pay.
这题为什么能选E呢？ |
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