A-A+
A．It is a well-kept tradition.B．It tends to be
问题详情
A．It is a well-kept tradition.
B．It tends to be superficial and artificial.
C．It is closely related to some organizations.
D．It is usually understood properly by visitors.
参考答案
正确答案：A
解析：文章提到美国人对陌生人的友好是历史发展的文化传统，故选A项。
