1.Which of the following is TRUE of the mammalian digestive system? a. All foods beginhteir enzymatic digestion in the mouth. b. After leaving the oral cavity,the bolus enters the larynx. c. The epiglottis prenvents food from entering the esophagus. d. Enzymatic digestion continues in the esophagus. e. The trachea leads to the esophagus and then to the stomach. 答案是C..我觉得B好像可以说..食团离开口腔以後进入喉头..(应该是这样吧..) 那就是说pharynx 跟 larynx是两个不同的地方搂?? 哪里不同呢??我是觉得很难分清楚..||-_- 2.Which of the following is NOT required for internal fertilization? a. copulatory organ b. sperm receptacle c. behavioral interaction d. internal development of embryo e. All of the above are necessary for internal fertilization. 答案是..D.. 不过这题有一半是我英文不好>"<.. B是储存精子的地方吗??体内跟体外授精的都有吧?? C我就看不太懂了.. D是体内成长的胚胎...体外授精也有需要体内成长胚的动物吗?? 所以我对这个答案也不是很了解.. 谢谢各位的回答<(_ _)> --

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