问题
多项选择题
紫外线杀菌作用的机理是使细胞核内（）
A.DNA内形成胸腺嘧啶二聚物
B.DNA的胸腺嘧啶分子脱落
C.DNA链断裂
D.RNA和蛋白质变性破坏
E.葡萄糖含量明显下降
答案
参考答案：A, D
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紫外线杀菌作用的机理是使细胞核内（）
A.DNA内形成胸腺嘧啶二聚物
B.DNA的胸腺嘧啶分子脱落
C.DNA链断裂
D.RNA和蛋白质变性破坏
E.葡萄糖含量明显下降
参考答案：A, D
阅读下列短文，根据所读的内容在文章后的表格中填入恰当的单词。注意表格中的每个空格只填1个单词。 As we get older and walk throughout lives we have to deal with change. Change is something that some people love and others are scared of and try to avoid. However, if you want your life to move forward and to be happy and successful, you have to realize that change is necessary. Welcome change with open arms, telling the world that you are not afraid. Although you will part with your present teachers and classmates, you will always be able to remember the things you used to do and the fun you used to have. When you feel sad, or when you are alone, you can close your eyes and imagine that you are black with your friends and teachers. Remember that your memories are your forever. Enjoy the time before you leave your school. If possible, you could take photographs of your friends and teachers to help you recall（回忆起）the past. Before you leave, you could also buy a notebook and ask your friends and teachers to write notes in it for you. They can write about the things they like about you, the things that they will remember about you, or they could just write their wishes for your success in the future. Perhaps you could buy a good hardback（精装本）book and combine the photographs and the notes together. You could also include your thoughts at the time of leaving the school. You could write lists of your favorite teachers, classes and sports activities. This is something you can treasure for the rest of your life.
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