M: There is a powerful new telescope being built in Arizona. Will that help them see these planets?

　　W: They should be able to see them at least in the form of small spots of light. And then the scientists will be able to break down and analyze this light. By doing this, they hope to learn about the chemical composition of these planets-oxygen and ozone molecules, for example, would be telltale signs of life on these planets.

　　M: Im looking forward to hearing more when the telescope is in operation. And Im sure our readers would be interested too.

　　Questions 23 to 25 are based on the conversation you have just heard.

　　23. What is the conversation mainly about?

　　24. How did the scientists establish the existence of the planets?

　　25. What does the professor say the scientists might learn about the planets by using the new telescope?

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