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A. Children stay there for one day and one night．
B. The time period ranges from 1 week to 8 weeks．
C. The cost is up to 700 dollars totally．
D. 4-year-olds are able to attend it．

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A. 肽键
B. 氢键
C. 糖苷键
D. 磷酸酯键
E. 3’.5’一磷酸二酯键

A. To please his father who was sick．
B. To make money for his father．
C. To help the American Liver Foundation．
D. To stay free of liver disease．

A. 葡萄糖
B. 核糖
C. 脱氧核糖
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