24. (29155-!-item-!-188;#058&003857)
Tiger beetles are such fast runners that they cancapture virtually any nonflying insect. However, when running toward an insect, the beetles intermittently stop,and then, a moment later, resume their attack. Perhaps they cannot maintain their pace and must pause for a moment'srest; but an alternative hypothesis is that while running tiger beetles areunable to process the resulting rapidly changing visual information, and soquickly go blind and stop.
Which of the following, if discovered inexperiments using artificially moved prey insects, would support one of the twohypotheses and undermine the other?
(A) When a prey insect is moved directly toward abeetle that has been chasing it, the beetle immediately turns and runs awaywithout its usual intermittent stopping.
(B) In pursuing a moving insect, the beetlesusually respond immediately to changes in the insect's direction, and pauseequally frequently whether the chase is up or down an incline.
(C) The beetles maintain a fixed time intervalbetween pauses, although when an insect that had been stationary begins toflee, the beetle increases its speed after its next pause.
(D) If, when a beetle pauses, it has not gained onthe insect it is pursuing, the beetle generally ends its pursuit.
(E) When an obstacle is suddenly introduced justin front of running beetles, the beetles sometimes stop immediately, but theynever respond by running around the barrier.
32. (31886-!-item-!-188;#058&005509)
State spokesperson: Many businesspeople who have not been to ourstate believe that we have an inadequate road system. Those people are mistaken, as is obvious fromthe fact that in each of the past six years, our state has spent more money permile on road improvements than any other state.
Which of the following, if true, most seriouslyundermines the reasoning in the spokesperson's argument?
(A) In the spokesperson's state, spending on roadimprovements has been increasing more slowly over the past six years than ithas in several other states.
(B) Adequacy of a state's road system is generallyless important to a businessperson considering doing business there than is theavailability of qualified employees.
(C) Over the past six years, numerous businesseshave left the spokesperson's state, but about as many businesses have movedinto the state.
(D) In general, the number of miles of road in astate's road system depends on both the area and the population of the state.
(E) Only states with seriously inadequate roadsystems need to spend large amounts of money on road improvements.
48. (34221-!-item-!-188;#058&007550)
Parasitic wasps lay their eggs directly into theeggs of various host insects in exactly the right numbers for any suitable sizeof host egg. If they laid too many eggsin a host egg, the developing wasp larvae would compete with each other to thedeath for nutrients and space. If toofew eggs were laid, portions of the host egg would decay, killing the wasplarvae.
Which of the following conclusions can properly bedrawn from the information above?
(A) The size of the smallest host egg that a waspcould theoretically parasitize can be determined from the wasp's egg-layingbehavior.
(B) Host insects lack any effective defensesagainst the form of predation practiced by parasitic wasps.
(C) Parasitic wasps learn from experience how manyeggs to lay into the eggs of different host species.
(D) Failure to lay enough eggs would lead to thedeath of the developing wasp larvae more quickly than would laying too manyeggs.
(E) Parasitic wasps use visual clues to calculatethe size of a host egg.
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发表于 2010-7-14 16:40:04
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