第一部分：阅读理解(共两节，满分40 分)
第一节(共15小题；每小题2分，满分30分)
阅读下面短文，从每题所给的四个选项（A、B、C和D）中选出最佳选项。
A
America is a mobile society. Friendships between Americans can be close and real, yet disappear soon if situations change. Neither side feels hurt by this. Both may exchange Christmas greetings for a year or two, perhaps a few letters for a while - then no more. If the same two people meet again by chance, even years later, they pick up the friendship. This can be quite difficult for us Chinese to understand, because friendships between us flower more slowly but then may become lifelong feelings, extending (延伸) sometimes deeply into both families.
