19. D　由该段最后一句可知，人们的疾病减少，因此比以前健康。

　　20. A　参见上题解析。人们身心都更加健康，有可能彻底摆脱疾病的困扰。get rid of“摆脱”。

　　.阅读理解

　　Hand gestures can be offensive, but recently a reserved, loving one has risen to popularity. To make it, curl the index fingers on both hands with the thumbs pointing down and join them to make a heart shape. Two people can make it together: a human version of those best­friends­forever lockets(盒式项链坠) that break apart to be shared.

　　Advertisers have taken note: it has appeared in campaigns for LensCrafters and the clothing line Miss Me. A hand heart with the top fingers splayed apart like wings, however, was removed from a Virginia tourism ad after revelations that it was a symbol of the Gangster Disciples.

　　The hand heart is popular in the rave(狂欢聚会) scene where tiggerlovesyou. com records young people enthusiastically hand­hearting. “The heart­hand symbol means something between ‘I love you’ and ‘thank you’，” the country singer Taylor Swift said in an e­mail from her “Speak Now” tour. “Its just a sweet, simple message that you can deliver without saying a word.” She added that she started doing it in pictures during high school.

　　One day during a festival, she said, she was in the middle of a song and decided to put her hands above her head in the heart shape. The crowd started doing this gesture and cheering.

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