【语篇解读】　本文是一篇说明文，主要介绍了幽默、大笑和玩耍给人们的健康带来的好处。

　　【难句分析】　 However, what we often forget is that it is just as important for old people to make play be part of their life as it's for children.

　　分析：本句中包含what引导的主语从句，that引导的表语从句。

　　译文：然而，我们经常忘记的是，让玩耍成为生活的一部分对老年人来说就像对孩子们来说一样重要。

　　1．What does the underlined word "infectious" in Paragraph 2 probably mean?

　　A．Playing an important role.

　　B．Keeping people in high spirits.

　　C．Quickly influencing other people.

　　D．Preventing illness from spreading.

　　答案与解析：C　考查词义猜测。根据第二段第四句"When laughter is shared between people, it makes them closer to each other and increases their happiness"可知，当人们分享笑容时，人们的关系更亲密，人们也会更加快乐。故infectious在此处意思为迅速影响其他人。

　　2．What can laughter increase according to the author?

　　A．Cognitive ability.　 B．Good relationships.

　　C．A sense of humor. D．Happiness and trust.

答案与解析：B　考查推理判断。根据第二段中的"When laughter is shared between people, it makes them closer to each other and increases their happiness... and you will feel happier just by sharing a smile, even with a stranger"可知，在作者看来大笑能使人们之间的关系更亲密。