书面表达。
目前，甲型流感（H1N1）在世界范围内传播很迅速，人们也很恐慌、害怕，根据下面的提示，
以How Do We Keep Healthy为题，写一篇短文。（80词左右）
参考词汇：wash hands，open the windows，keep clean，public places，healthy food，do more
exercise，enough sleep，keep happy，had better see the doctor
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