Summer is a special time when "many Americans （）

单项选择题Which of the following is the topic sentence of the second paragraph（）

A．For many of us summer is a special time for forming new friendships.
B．Today millions of Americans vacation abroad.
C．No one really expects a vacation trip to produce a close friend.
D．But surely the beginning of friendship is possible.

单项选择题When summer comes, many Americans （）

A．hope to meet new people
B．expect to find some close friends
C．want to begin lasting friendships with new people
D．both A and B