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Often patients with ankle fractures that are stable, and thus do notrequire surgery, are given follow-up x-rays because their orthopedistsare concerned about possibly having misjudged the stability of the fracture. When a number of follow-up x-rays were reviewed, however, allthe fractures that had initially been judged stable were found to havehealed correctly. Therefore, it is a waste of money to order follow-upx-rays of ankle fracture initially judged stable.
Which of the following, if true, most strengthens the argument?
A. Doctors who are general practitioners rather than orthopedists areless likely than orthopedists to judge the stability of an ankle fracture correctly.
B. ！Many ankle injuries for which an initial x-ray is ordered are revealedby the x-ray not to involve any fracture of the ankle.
C. X-rays of patients of many different orthopedists working in severalhospitals were reviewed.
D. The healing of ankle fractures that have been surgically repaired isalways checked by means of a follow-up x-ray.
E. Orthopedists routinely order follow-up x-rays for fractures of boneother than ankle bones.
GWD-24-29.
Plant scientists have been able to genetically engineer vegetable seedsto produce crops that are highly resistant to insect damage. Althoughthese seeds currently cost more than conventional普通的 seeds, their cost is likely to decline. Moreover, farmers planting them can use far less pesticide, and most consumers prefer vegetables grown with less pesticide,therefore, for crops for which these seeds can be developed, their use is likely to become the norm.
Which of the following would be most useful to know in evaluating theargument above?
A. Whether plant scientists have developed insect-resistant seedsfor every crop that is currently grown commercially
B. Whether farmers typically use agricultural pesticides in largeramounts than is necessary to prevent crop damage.
C. Whether plants grown from the new genetically engineered seedscan be kept completely free of insect damage.
D. ！Whether seeds genetically engineered to produce insect-resistantcrops generate significantly lower per acre crop yields than docurrently used seeds.
E. Whether most varieties of crops currently grown commercially havegreater natural resistance to insect damage than did similar varieties in the past.
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发表于 2011-1-24 11:20:52
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