同志们~~求详细解答啊~~~GWD

Natalie8924

Often patientswith ankle fractures that are stable, and thus do not require surgery, aregiven follow-up x-rays because their orthopedists are concerned about possiblyhaving misjudged the stability of the fracture. When a number of follow-upx-rays were reviewed, however, all the fractures that had initially been judgedstable were found to have healed correctly. Therefore, its is a waste of moneyto order follow-up x-rays of ankle fracture initially judged stable.
Which of thefollowing, if true, most strengthens the argument?
A  Doctors who are general practitioners ratherthan orthopedists are less likely than orthopedists to judge the stability ofan ankle fracture correctly.
B  Many ankle injuries for which an initialx-rays is ordered are revealed by the x-ray not to involve any fracture of theankle.
C  X-rays of patients of many differentorthopedists working in several hospitals were reviewed.
D   The healing of ankle fractures that have beensurgically repaired is always checked by means of a follow-up x-ray.
E   Orthopedists routinely order follow-up x-raysfor fractures of bone other than ankle bones.无关选项

The milk of manymammals contains cannabinoids, substances that are known to stimulate certainreceptors in the brain. To investigate the function of cannabinoids,researchers injected newborn mice with a chemical that is known to blockcannabinoids from reaching their receptors in the brain. The injected miceshowed far less interest in feeding than normal newborn mice do. Therefore,cannabinoids probably function to stimulate the appetite.
Which of thefollowing is an assumption on which the argument depends?
A  Newborn mice do not normally ingest anysubstance other than their mothers’ milk.
B  Cannabinoids are the only substances inmammals’ milk that stimulate the appetite.
C    the mothers of newborn mice do not normally make any effort to encourage their babies to feed
D   The milk of mammals would be less nutritiousof it did not contain cannabinoids.
E   The chemical that blocks cannabinoids fromstimulating their brain receptors does not independently inhibit the appetite.