蛋白质的变性作用不能引起（）结构的破坏。A.一级 B.二级 C.三级 D.四级 发布时间：2017-05-19 06:32 │ 来源：www.tikuol.com 题型：单项选择题 问题： 蛋白质的变性作用不能引起（）结构的破坏。A.一级B.二级C.三级D.四级
题型：单项选择题 阅读下面的短文，请从方框中选出适当的句子填入文中适当的位置，使短文内容完整正确。 Ladies and gentlemen, thanks a lot for joining us. I hope you have enjoyed the music. 1 Every day, hundreds of children in Africa lose their young lives because they have terrible diseases or don't have enough to eat. Most African countries are poor. 2 And many parents have no work, so they have little money to buy food or medicine. We hold the concert to collect money for the children in Africa. 3 For example, the Feed Africa Fund spends millions of dollars every year on food for them in Africa. All the money comes from kind and generous people, just like all of you. 4 Just one dollar can buy enough rice or corn to feed a family of four for three days. 5 Ten dollars? Twenty dollars? I am sure you can spend a little less on your own food so that you have a few dollars for the Feed Africa Fund. Ladies and gentlemen, we now make a collection for the children in Africa. Please be generous. Thank you.Many organizations are trying to help the poor in Africa.Now, please allow me to tell you why we hold this concert.Every dollar you give this evening will go to the Feed Africa Fund.The governments have no money to take good care of the poor.How much do you spend on food every day? 查看答案