1. The Environmental Protection Agency must respond to the hazard to children's health posed by exposure to asbestos fibers released in the air in school classrooms. Since it is impossible to close school buildings, the best plan would be to initiate programs that mandate the immediate removal of asbestos from all the school buildings that are found to contain asbestos, regardless of whether or not the buildings are in use.
Which of the following, if true, is the strongest reason for the Environmental Protection Agency not to follow the plan outlined above?
(A) The techniques available for removing asbestos often increase the level of airborne asbestos.
(B) Schools are places where asbestos is especially likely to be released into the air by the action of the occupants.
(C) Children exposed to airborne asbestos run a greater risk of developing cancer than do adults exposed to airborne asbestos.
(D) The cost of removing asbestos varies from school to school, depending on accessibility and the quantity of asbestos to be removed.
(E) It is impossible to determine with any degree of certainty if and when construction materials that contain asbestos will break down and release asbestos fibers into the air.
2. Aedes albopictus, a variety of mosquito that has recently established itself in the southeastern United States, is less widespread than the indigenous swamp mosquito. Both the swamp mosquito and A. albopictus can carry viruses that are sometimes fatal to humans, but A. albopictus is a greater danger to public health. Each of the following, if true, provides additional information that strengthens the judgment given about the danger to public health EXCEPT:
(A) Unlike the swamp mosquito, A. albopictus originated in Asia, and larvae of it were not observed in the United States before the mid 1980's.
(B) Unlike the swamp mosquito, A. albopictus tends to spend most of its adult life near human habitation.
(C) Unlike swamp mosquito larvae, A. albopictus larvae survive in flower pots, tincans, and many small household objects that hold a little water.
(D) In comparison with the swamp mosquito, A. albopictus hosts a much wider variety of viruses known to cause serious diseases in humans.
(E) A. albopictus seeks out a much wider range of animal hosts than does the swamp mosquito, and it is more likely to bite humans.
The manager of a horse show is placing seven obstacles-one chicken coop, one gate, two stone walls, and three fences-on a jumping course that consists of seven positions, numbered and arranged consecutively from 1 to 7. The placement of the obstacles in the seven positions must conform to the following conditions: No two fences can be placed in consecutive positions.The stone walls must be placed in consecutive positions.
3. Which of the following is an acceptable placement of obstacles in the seven positions,in order from the first position to the last position on the course?
(A) Chicken coop, fence, gate, stone wall, fence,stone wall, fence
(B) Fence, gate, fence, fence, chicken coop,stone wall, stone wall
(C) Fence, stone wall, stone wall, gate, chicken coop, fence, fence
(D) Gate, stone wall, stone wall, fence, fence,chicken coop, fence
(E) Stone wall, stone wall, fence, chicken coop,fence, gate, fence
4. If one of the fences is in the third position and another is in the sixth position, which of the following must be true?
(A) The chicken coop is in the seventh position.
(B) The gate is in the second position.
(C) The gate is in the seventh position.
(D) One of the stone walls is in the first position.
(E) One of the stone walls is in the fourth position.
5. If one of the stone walls is in the seventh position,which of the following must be FALSE?
(A) The chicken coop is in the second position.
(B) The chicken coop is in the fourth position.
(C) One of the fences is in the first position.
(D) One of the fences is in the second position.
(E) The gate is in the fourth position.
6. Which of the following CANNOT be the positions occupied by the three fences?
(A) First, third, and fifth
(B) First, third, and sixth
(C) Second, fourth, and sixth
(D) Second, fourth, and seventh
(E) Third, fifth, and seventh