从方框中选择正确选项．并将其字母序号写在对话后面的空格内。(方框中有一个选项与对话内容无关)

Celia: Hi Tony! You look upset. What's wrong?
Tony: I failed the exam again. I'm afraid I have to give up my study.
Celia: No, never. If you do that, you will let your parents down.      ____ 
Tony: Yes. I want to practice basketball and become a basketball player like Yao Ming or Kobe.
Celia:    ____ 
Tony: Because it's my dream job. If I am famous, I can make lots of money.
Celia: Money is important.    ____ 
Tony: I know. But I want to hold on to my dream.
Celia: Have you ever talked with your parents?
Tony:   ____  But they don't agree. They want me to be a doctor.
Celia: I think you'd better take your parents'advice.
Tony: Maybe you're right. But why can't 1 make my own decisions?
Celia: Come on, Tony.  ____      After all, your parents have more experience.
Tony: Anyway, I’ll think about it. Thanks for your advice.

在下列条件中，不能判定两直角三角形全等的是（　　）

下列各式﹣3x，$\frac{x+y}{x-y}$，$\frac{xy-y}{3}$，﹣$\frac{3}{10}$，$\frac{2}{5+y}$，$\frac{3}{x}$，$\frac{x}{4xy}$中，分式的个数为（　　）

获得2009年诺贝尔生理学或医学奖的三位美国科学家，凭借“发现端粒和端粒酶是如何保护染色体的”这一成果，揭开了人类衰老和罹患癌症等严重疾病的奥秘．端粒酶与肿瘤的关系已成为近年来研究的热点．请根据提供的材料回答下列问题：

（1）端粒酶是与染色体末端结构相关的一种细胞组分．表中数据显示细胞癌变可能与端粒酶的活性有关．

请完成下面的探究实验：

实验目的：探究端粒酶与细胞癌变的关系．

实验材料：癌细胞、端粒酶抑制剂、细胞培养液等．

实验步骤：

①癌细胞分成等量的A、B两组．

②A组加入____ ，B组不加，在____  条件下培养．

③记录观察A、B两组细胞的____ ．

结果预测及分析：____ 

（2）请根据上述内容，提出一种治疗癌症的新思路：____ ．