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GMAT逻辑削弱题在线练习三

2018-05-08 17:08:00 来源:网络GMAT资料下载

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  11(Z5).During the month of May, crabs arrive on Delaware’s beaches to lay eggs. Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds. Delaware’s crab population has declined recently. This decline, however, poses no serious threat to the migrating shorebird populations: by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.

  Which of the following, if true, most seriously weakens the argument?

  A. No other food available to the birds on Delaware’s beaches is as nutritious and accessible as are crab eggs.

  B. The decline in the number of crabs on Delaware’s beaches is due to the harvesting of crabs by humans.

  C. There are more crabs on Delaware’s beaches than in any other area that the migrating birds pass through.

  D. The crabs do not conceal their eggs.

  E. The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully.

  12.(Z15)A survey of entrepreneurs who started companies last year shows that while virtually all did substantial preparatory research and planning, only half used that work to produce a formal business plan. Since, on average, the entrepreneurs without formal plans secured the capital they needed in half the time of those with plans, these survey results indicate that, in general, formal plans did not help the entrepreneurs who produced them to secure the capital they needed.

  Which of the following, if true, most seriously weakens the argument?

  A. Companies started by entrepreneurs who had used formal business plans to attract investment were on the whole as profitable in their first year as were companies started by entrepreneurs who had not produced such plans.

  B. In surveys of entrepreneurs who have attempted without success to raise sufficient capital, more than half of the respondents indicate that they have produced a formal business plan.

  C. Among the entrepreneurs surveyed, those who did not produce formal business plans sought and received a much larger proportion of their capital from investors with whom they had a long-standing business relationship.

  D. The entrepreneurs surveyed who did not produce a formal business plan spent nearly as much time doing preparatory research and planning as the entrepreneurs who produced plans.

  E. The entrepreneurs who produced business plans generally reported later that the process of writing the plan had increased their confidence that their company would succeed.

  13.(Z18)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?

  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.

  14.(Z18)Political Advertisement:

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