gwd-24-35 A有什么问题？ - ChaseDream

The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected mice showed far less interest in feeding than normal newborn mice do. Therefore, cannabinoids probably function to stimulate the appetite.

B) Cannabinoids are the only substances in mammals’ 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 mild of mammals would be less nutritious if it did not contain cannabinoids.

E) The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.

答案是e，我同意，认为是最佳答案，排除他因，问题是A似乎也有点道理，不明白各位是什么理由否定A的？谢谢：）

以下是引用julyyuren在2006-9-9 2:27:00的发言：

A) Newborn mice do not normally ingest any substance other than their mothers’ milk.

B) Cannabinoids are the only substances in mammals’ 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 mild of mammals would be less nutritious if it did not contain cannabinoids.

E) The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.

答案是e，我同意，认为是最佳答案，排除他因，问题是A似乎也有点道理，不明白各位是什么理由否定A的？谢谢：）