题目

       As I was making my way to the coffee shop ,  I noticed an older gentleman poorly dressed  sitting on a   21  nearby. I knew from first sight that he was in need of some kind of     22  . He had a little lunch stretched out in front of him and was wholeheartedly   23  it.        Then I   24   the line and waited to be served. There was a young man in front of me.  He handed the waitress a twenty dollar bill and   25  an orange juice and a   26  . The  waitress looked at the young man a little   27   , not fully understanding the request.仔细阅读图一和图二，请据图回答问题．（1）写出图一中下列编号所代表的中文名称：④ ；⑨ ．（2）图二所示过程叫 ．此过程必须遵循 原则．（3）假如图二中的亲代DNA分子含有1000个碱基对，将这个DNA分子放在用32P标记的脱氧核苷酸的培养液中让其复制一次，则新形成的DNA的相对分子质量比原来增加了 ．（4）图二中的亲代DNA分子，在复制时，一条链上的G变成了C，则DNA经过n次复制后，发生差错的DNA占 ．A.12       B.12n-1    C、12n    D、12n+1．