Questions 19 to 22 are based on the following conversation:
Conversation One
A: Well, Mike, I often hear people talk about gene therapy. But what's on earth is it?
B: We know that genes are the basic units of heredity and they encode instructions on how to make proteins.
A: Yeah. Proteins are very essential to human body.
B: Right. Proteins perform most life functions and even make up most of cellular structures. So when genes are altered, the encoded proteins are unable to carry out their normal functions, this can result in genetic disorders.
A: I see. Then gene therapy is to correct defective genes, isn't it?
B: Yeah, you can say that.
A: But how?
B: Well, there are several ways, such as gene replacement to replace a nonfunctional gene with a normal one. This approach is most common. And also others like gene correction, gene augmentation, gene inactivation or immune adjustment are ways of therapy..
A: It sounds many genetic diseases then could be cured with this new technology.
B: Theoretically it is. But currently it's still experimental and has not proven very successful in clinical trials. Little progress has been made since the first gene therapy clinical trial began in 1990.
A: We're just holding our breath for it.
19.What is the conversation mainly about?
20.What carries out most life functions?
21.What is the gene therapy?
22.Which of the following statements is true?
19. 答案：C
解析：逻辑判断题。A, B, D都是对话中的细节，这篇对话主要是谈论基因疗法的。
20. 答案：A
解析：细节题。从原文Proteins perform most life functions可以得出正确答案是A。
21. 答案：C
解析：细节题。由文章Then gene therapy is to correct defective genes, isn't it? Yeah, you can say that.可判断C是正确答案。考生应知道defective是imperfect的意思。
22. 答案：B
解析：推理判断题。由原文Theoretically it is. But currently it's still experimental and has not proven very successful in clinical trials.可以推断出正确答案是B。
Questions 23 to 25 are based on the following conversation:
Conversation Two
A: You look perfect in your new dress. It's the newest style, isn't it?
B: Yeah, I like it very much. Thank you. You can't imagine how cheap it is.
A: You got it on sale.
B: No, I got it from the internet.
A: From the internet?
B: Yeah. More and more people are now beginning to shop via the net.
A: E-commerce is thriving.
B: Well, shopping on the internet does bring much convenience.
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