請問黃金閱讀的Types of Social Groups - 英檢

Paragraph 1：Life places us in a complex web of relationships with other
people. Our humanness arises out of these relationships in the course of
social interaction Moreover, our humanness must be sustained through social
interaction—and fairly constantly so. When an association continues long
enough for two people to become linked together by a relatively stable set of
expectations, it is called a relationship.

2. According to paragraph 1, which of the following is true of a relationship?
○ It is a structure of associations with many people.
○ It should be studied in the course of a social interaction.
○ It places great demands on people.
○ It develops gradually overtime.


想請問，答案為什麼是四而不是三呢？

另外it places great demans on people, 意思是一段關係很需要人，

或反之人類均需人際關係？


問題好像很笨...希望高手指教

謝謝

--