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GMAT逻辑削弱题在线练习四

2018-05-09 17:08:00来源：网络

　　19.(Z20)A major chemical spill occurred five years ago at Baker’s Beach, the world’s sole nesting ground for Merrick sea turtles, and prevented nearly all the eggs laid that year from hatching. Yet the number of adult female Merricks returning to lay their eggs at Baker’s Beach has actually increased somewhat since five years ago. Clearly, environmentalists’ prediction that the world’s Merrick population would decline as a result of the spill has proven unfounded.

　　Which of the following, if true, most seriously undermines the argument offered in refutation of the environmentalists’ prediction?

　　A. The chemical spill five years ago occurred at a time when there were neither Merrick sea turtles nor Merrick sea turtle eggs on Baker’s Beach.

　　B. Female Merrick sea turtles begin returning to Baker’s Beach to lay their eggs when they are ten years old.

　　C. Under normal conditions, only a small proportion of hatchling female Merrick sea turtles survive in the ocean until adulthood and return to lay their eggs at Baker’s Beach.

　　D. Environmental pressures unrelated to the chemical spill have caused a significant decline in the population of one of the several species of sea birds that prey on Merrick sea turtle eggs.

　　E. After the chemical spill, an environmental group rejected a proposal to increase the Merrick sea turtle population by transferring eggs from Baker’s Beach to nearby beaches that had not been affected by the spill.

　　Secret passwords are often used to control access to computers. When emoployees

　　As their initials or birth dates. To improve security, employers should assign ran-

　　domly generaied passwords to employees rather than allowing employees to make up their own

　　20.(Z21)Which of the following, if true, most seriously undermines the conclusiun drawm above?

　　A. if passwords are generated randomly, it is theoretically possible that employees will be assigned passwords that they might have selected on their own.

　　B. Randomly generated passwords are so difficult for employees to recall that they often record the passwords in places where the passwords could be easily

　　seen by others.

　　C. Computer systems protected by passwords are designed to ignore commands that are entered by employees or others who use invalid passwords.

　　D. In general, the higher the level of security maintained at the computer system, the more difficult it is for unauthorized users to obtain access to the system.

　　E. Control of physical access to computers by the use of locked doors and guards should be used un addition to passwords in order to maintain security.

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