16.【解析】选C。考查动词。share at least one loud laugh意为“至少共同大笑一次”。

　　17.【解析】选A。考查名词。由上题分析可知。

　　18.【解析】选B。考查形容词。在他的幽默感染下，学习变得更为轻松愉快，也更能持久。

　　19.【解析】选D。考查形容词。生活使智者微笑，使愚者哭泣，如果（If）此话当真，那么（then）我这位朋友肯定是个智者。

　　20.【解析】选C。考查副词。详见上题分析。

　　BEIJING(01-20-2012)-Zhao Benshan,

　　one of the most famous Chinese comics(喜剧演员),

　　announced on Thursday that he has decided to be absent from the Spring Festival Evening Party,

　　mainland’s most-viewed show,

　　which is organized by China Central Television (CCTV) and staged on the eve of Spring Festival.

　　Every year since 1990,

　　the 55-year-old Liaoning native,

　　has taken part in the show. But according to a statement released by CCTV on its micro-blog on Thursday,

　　Zhao will not appear because of his fatigue.

　　Zhao has fully prepared for his part in the show and has participated in several rehearsals (彩排) though he has been ill,

　　according to the statement,

　　but he finally decided to leave the show because “he felt exhausted and excessively tired”.

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