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?Q13 GWD-24-35（CD-10-35）
?The milk of many mammals contains cannabinoids, substances that are known to stimulatecertain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with achemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showedfar less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate theappetite.
?Which of the following is an assumption onwhich the argument depends?
?
A.Newborn mice do not normally ingest anysubstance other than their mothers’ milk.
B.Cannabinoids are the onlysubstances in mammals’ milk that stimulate the appetite.
C.The mothers of newborn mice do not normallymake any effort to encourage their babies to feed.
D.The milk of mammals would be less nutritiousif it did not contain cannabinoids.
E.The chemical that blocks cannabinoids from stimulating their brain receptors doesnot independently inhibit the appetite. | 
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发表于 2011-10-3 16:39:52
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