for in a good friend.可看出找好朋友需要看对方的品德；其次根据第三段中当出现分歧时，要合理解决，由此可知一段好的友情是需要经营的，故选B。

2．Paragraph 3 is mainly about ________．

A．why drugs are bad for teenagers

B．whether a friend is reliable

C．ways that help avoid arguments

D．problems that will test friendship

D　解析：段落大意题。根据第三段中Some matters can seriously affect friendship.可知一些问题会影响友情，故选D。

3．According to the author，which matters least in friendship?

A．Confidence.　　　　　 B．Age.

C．Sense of humor. D．Communication.

B　解析：细节理解题。根据第五段中Good friends do not always have to be in the same age group as you.可知年龄在友谊中不重要，故选B。

4．Which of the following sayings can match the author's view on friendship?

A．Old friends and old wines are best.

B．A friend without faults will never be found.

C．A friend to everybody is a friend to nobody.

D．A life without a friend is a life without sunshine.

D　解析：推理判断题。根据最后一句I think friendship is one of the most important things in life because if you have no friends you will have no happiness.可知作者认为友情十分重要，故选D。

　　Today，the number of single adults in the U．S. and many other nations is unprecedented(前所未有的)．The condition has left some in panic.Some Americans worry that the country's moral values may get worse，and one of their top reasons is the large number of single people.But instead of worrying，maybe we should celebrate.

I'm a social scientist，and I've spent the past two decades researching and writing about