[解析]
(1)D.细节理解题.根据第一段句子: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,如果这两个人再次偶然相遇,即使是几年后,他们也会重拾友谊.这对我们中国人来说是很难理解的.可见即使在很长时间的破裂之后,美国人仍将继续他们的友谊.所以选D.
(2)C.细节理解题.根据第三段最后一句"Once we arrive at their homes,the welcome will be full,warm and real.We will find ourselves treated hospitably."一旦我们到了他们的家,会受到热情欢迎,温暖而又真实.我们会发现自己被亲切对待.故选C.
(3)D.词义猜测题.根据文中"they don't show their politeness to us if it requires a great deal of time."说明当美国人忙的时候他们对自己的时间很苛刻,所以可知中国人对待自己的时间是慷概的,故选D.
(4)D.主旨大意题.本文主要说的是中美之间对友谊的观点,故选 D