问题
单项选择题
噬菌体侵染细菌的实验证明了（）
A．蛋白质是遗传物质
B．DNA是遗传物质
C．DNA是主要的遗传物质
D．DNA是遗传物质，蛋白质不是遗传物质
答案
参考答案：B
解析：噬菌体侵染细菌实验证明了遗传物质是DNA，蛋白质没有注入细菌体内，无法证明蛋白质不是遗传物质，所以B选项正确。
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噬菌体侵染细菌的实验证明了（）
A．蛋白质是遗传物质
B．DNA是遗传物质
C．DNA是主要的遗传物质
D．DNA是遗传物质，蛋白质不是遗传物质
参考答案：B
解析：噬菌体侵染细菌实验证明了遗传物质是DNA，蛋白质没有注入细菌体内，无法证明蛋白质不是遗传物质，所以B选项正确。
Please look at the photo. It is the photo 1 my family. This is my grandfather.2 name is Dave Hand. He is a doctor. And this is my grandmother. Her name 3 Anna Brown. She is my father’s 4 . The tall man is my father. He likes playing baseball. He 5 cool. The nice woman is my mother. She likes watching TV. She has 6 yellow ring. The man with glasses is my 7 . He is my father’s brother. His 8 is Paul. He comes to see my grandparents with Emma and their daughter Mona. Look! The young woman is my aunt. Her 9 name is Smith. And the little girl is my 10 . Her name is Mona Hand. The boy in the photo is Tim. It’s me.
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