阅读理解B
Paul：Good morning, Alan．
Alan：Good morning, Paul．Look at that boy．I never(从未)saw him before．
Paul：The boy in the blue jacket?
Alan：No. The boy is in red．He is playing baseball．
Paul：Oh, he is a new student in my class．His name is Mike Smith．
Alan：He plays well!
Paul：Yes, he is on the baseball team(队). His father is good at it, too．
Alan：Is his father a baseball player(运动员)?
Paul：No, he is a doctor．
Alan：What about his mother?
Paul：His mother is an English teacher in our school. She is nice．
Alan：When did they come to Shanghai'?
Paul：Last month. They will live here for a year and then go to Beijing．
Alan：You know a lot about Mike．
Paul：Yes. We' re good friends．
根据材料内容选择最佳答案。

为了保护南极的生态环境，到南极考察的科学工作者不仅要把塑料等难以降解的垃圾带离南极，还要把粪便等生活垃圾带离南极，这是因为南极（    ）

现有一待测核酸样品，经检测后，对碱基数目统计的结果如下：(A＋T)/(C＋G)＝1，(A＋G)/(C＋T)＝1，根据此结果，该样品(  )

将稀硫酸滴入一定量的氧化铜粉末中，使固体刚好溶解后滴入适量的氢氧化钠溶液至反应完全．请依次写出相关的化学反应方程式：

（1﹣2x）⁴展开式中含x项的系数（   ）