一道高考7选5,请详解,72空应选b还是e?

一道高考7选5,请详解,72空应选b还是e?
Friends play an important part in our lives,and although we may take the fact of friendship for granted,we often don’t clearly understand how we make friends.While we get on well with a number of people,71 ．
Moreover,a great many relationships come under the general term “friendship”．In all cases,two people like one another and enjoy being together,but beyond that,the degree of closeness between them and the reasons for their interest in each other change greatly．
At the beginning,much depends on how people meet,and on good first impressions.As we
get to know people,72 .Although these factors are not of the greatest importance,it is more
difficult to have a good relationship with people when there is a big difference in age and background．
Then,73 ．Friends will stand closer together and will spend more time looking at each other than ordinary friends．Smiles and soft voices also express friendliness,and it is because they may give the wrong signals that shy people often have difficulty making friends.A friendly look with a wrong facial expression can turn into an unfriendly stare,and nervousness may be wrongly understood as unfriendliness．
Some relationships are a result of argument and discussion,but it is usual for close friends to have the same ideas and beliefs,the same opinion and interests.The more closely involved people become．the more they depend on each other.And 74 .Equally,friends have to learn to make allowances for each other,to put up with annoying habits,and to accept differences in opinion.
In contrast with marriage,75 .But the support and understanding that results fro m shared experiences and affections does seem to create a close and lasting relationship
A．we are usually friends with only a few
B．many factors can affect friendship and relationship
C．people want to do friends favors and hate to let them down
D．argument and discussion can improve personal relationships
E．we consider things like age,race,looks,economic and social status,etc
F．we pay attention to actual behavior,facial expression,and the way a person speaks
G．there a re no friendship ceremonies to strengthen the relationship between two people