问题
单项选择题
Which of the following best describes the overall organization of the passage
A．The author describes a concept by analyzing its three forms,
B．The author compares and contrasts two types of human relations.
C．The author presents the points of view of three experts on the same topic.
D．The author provides a number of concrete examples and then draws a conclusion.
答案
参考答案：A
解析：[分析] 主旨题型。 阅读全文发现，第一段第一句解释了什么是cooperation，随后又做了类比；后面三段则分别描述了cooperation的三个级别；因此选项A为答案。