(单选题)

The author gives the example alligators in Paragraph 3 mainly to show that ______.

A.there are rules concerning with whom it is appropriate to eat

B.cultural norms and seasons determine what a person consumes

C.environmental factors can influence personal eating habits

D.acceptable foods sometimes are not determined by whether or not something is edible

参考答案：D

参考解析：

细节理解题。根据第三段第一、二句“In each culture there are both acceptable and unacceptable foods, though this is not determined by whether or not something is edible.”可知，在每种文化中都有可接受的和不可接受的食物，尽管这不是由某物是否可食用来决定的。接下来的短吻鱼的例子（世界上许多地方都有短吻鳄，但许多人不接受它们作为食物。）就是为了说明此观点。故选D。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语