问题
问答题 简答题
简述核酸的分类和分子组成。
答案
参考答案：
核酸分为核糖核酸（RNA.和脱氧核糖核酸（DNA.两大类：
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简述核酸的分类和分子组成。
参考答案：
核酸分为核糖核酸（RNA.和脱氧核糖核酸（DNA.两大类：
Mr. Smith worked in a big computer company. He had no wife, and of course, had no child, 41 . He lived in an old house 42 . He liked nothing but drinking. He almost spent all of his money 43 drinks. One night, Mr. Smith met a friend of his on his way home. The man asked him to have dinner in a 44 . He was happy and drank a lot. When they 45 the meal, Mr. Smith could hardly walk. His friend had to stop a taxi and asked the driver to take him 46 . Soon the taxi arrived at Mr. Smith’s house. With the help of the 47 , he got out of the taxi. “Thank you, sir,” said Mr. Smith. “And I can 48 the door by myself.” The taxi driver then went away. But Mr. Smith couldn’t put the key into the key hole. He tried many times 49 he still failed. At that time, a policeman passed there. “Can I help you open the door, sir?” asked the policeman. “Thank you, sir. But I don’t think you can.” said Mr. Smith. “My house is circling (转圈) now. If you can stop it from 50 , I can open the door by myself.”
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