[解析]
(1)细节理解题。根据第一段We move from town to city to suburb,from high school to college in a different state,from a job in one region to a better job elsewhere,from the home where we raise our children to the home where we plan to live in retirement.(我们从城镇搬到城市到郊区,从高中搬到不同州的大学,从一个地区的一份工作到其他地方更好的工作,从抚养孩子的家搬到我们计划退休生活的家)可知,许多美国人一生不停的换地方,目的是上学,工作,退休,而不是为了省钱。故选C项。
(2)细节理解题。根据第二段For many of us summer is a special time for forming new friendships.Today millions of Americans vacation abroad,and they go not only to see new sights but also with the hope of meeting new people.(对我们许多人来说,夏天是结交新朋友的特殊时间。今天,数以百万计的美国人出国度假,他们不仅去看新的风景,而且希望结识新朋友)可知,夏天是许多美国人到其他国家旅行的特殊时间。故选D。
(3)细节理解题。根据第二段Today millions of Americans vacation abroad,and they go not only to see new sights but also with the hope of meeting new people. (如今,数以百万计的美国人出国度假,他们去不仅是为了看到新的风景,而且还希望结识新的朋友)可知,当夏天到来时,许多美国人希望结识新朋友。故选B。
(4)段落大意题。根据第二段Today millions of Americans vacation abroad,and they go not only to see new sights but also with the hope of meeting new people.No one really expects a vacation trip to produce a close friend,but the beginning of a friendship is possible. (对我们许多人来说,夏天是结交新朋友的特殊时间。今天,数以百万计的美国人出国度假,他们不仅去看新的风景,而且希望结识新朋友。没有人真的期望一次度假旅行就能产生一个亲密的朋友,但是一段友谊的开始是可能的)可知,本段主要介绍了对许多美国人来说,夏天是结交新朋友的特殊时间。由此可知,B选项适合作本段主题句。故选B。