32.What favor does Don want someone to do for him?

　　33.What does Janet offer to do?

　　34. What does Janet almost forget to ask Professor Webster to do?

　　-Questions 35-39. Listen to two students talk about an experiment in a science class.

　　- M: Have you done the lab for physiology yet---the one on taste?

　　- W: Yeah, it was kind of fun---mapping the taste buds? Didn’t you think so?

　　- M: I’m doing it this afternoon. How long will it take?

　　- W: It went pretty quickly---under an hour, anyway. See, first you mix up the four solutions.

　　- M: You take water and add either sugar, lemon juice, salt, or…What was it?

　　- W: Bitter quinine.

　　- M: That’s it…uh…then what?

　　- W: Then all you have to do is taste each sample and describe where each flavor seems most intense.

　　- M: Is that hard?

　　- W: Not really. One thing to remember though---not all the taste buds are on the tongue.

　　- M: Right. I’ll keep that in mind. And thanks for going over this with me. Maybe we could talk about this after I’ve tried it---we could get a pizza or something.

　　- W: Great. Give me a call.

　　35. What is the main purpose of the lab experiment?

　　36.About how long does it take to do the experiment?

　　37. What does the woman remind the man about?

　　38. How does the man close the conversation?

　　-Questions 39-42. Listen to “Science Watch,” a daily radio program.

　　- W: Word comes form California of a new weapon I the war on household pests. Two scientists working for a firm in Anaheim, California, have developed a method to eliminate insects without using dangerous chemicals. The new poison? Hot air. The basic idea is that insects cannot adjust to temperatures much above normal. In laboratory experiments, cockroaches and termites can’t survive much more than a quarter of an hour at 125 degree F, or about 50 degrees centigrade.

　　- The new method involves covering a house with a huge tent and filling it with air heated to around 65 degrees centigrade. Hot air is forced in with fans, and the tent keeps the heat inside the house. Since termites try to escape by hiding in wooden beams, the heat treatment must be continued for a full six hours. But when it’s all over and the insects are dead, there are no toxic residues to endanger humans or pets and no funny smells. Scientists claim that there is no danger of fire, either, since very few household materials will burn at 65 degrees centigrade in fact wood is prepared for construction use by drying it in ovens at 80 degrees centigrade, which is substantially hotter than the air used in this procedure.

　　39. What is the talk mainly about?

　　40. According to the speaker, what makes the new system better than other treatments.?