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听力原文：M: Tony said he would help me if he had time.
W: He often offers his help, but he never seems to have time.
Q: What does the woman say about Tony？
(15)
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听力原文：W: Hi, Peter.
M: Judy, I haven't seen you in weeks. Where have you been.？
W: In Florida.
M: What？ Vacationing while the rest of us have been studying on campus in the February cold.
W: Not exactly. I spent most of my time underwater.
M: I don't understand.
W: I was on a special field trip. I went with my marine biology class.
M: So you went Scuba diving, what were you looking for, sunken treasure？
W: You might say so. The sea is full of treasures, 'all kinds of strange fascination things.
M: Oh, how wonderful it is.
W: Yeah, by concentrating, I was able to see the outlines of lots of different plants and animals under the sea. In fact, our professor even took photographs of small oceanic snails.
M: That sounds like a interesting trip. But I think if I'd been in Florida in February, I'd much rather spend my time just swimming and lying ,in the sun.
(23)
Through a series of experiments, an American scientist has obtained an understanding of the social structure of the most complex of ant societies. The ants examined are the only creatures other than man to have given up hunting and collecting for a completely agricultural way of life. In their underground nests they cultivate gardens on soil made from finely chopped leaves. This is a complex operation requiring considerable division of labor. The workers of this type of ant can be divided into four groups according to size. Each of the groups performs a particular set of jobs.
The making and care of the gardens and the nursing of the young ants are done by the smallest workers. Slightly larger workers are responsible for chopping up leaves to make them suitable for use in the gardens and for cleaning the nest. A third group of still larger ants do the construction work and collect fresh leaves from outside the nest. The largest are the soldier ants, responsible for defending the nest.
To find out how good the various size-groups are at different tasks, the scientist measured the amount of work done by the ants against the amount of energy they used. He examined first the gathering and carrying of leaves. He selected one of the size-groups, and then measured how efficiently these ants could find leaves and run back to the nest. Then he repeated the experiment for each of the other size-groups. In this way he could see whether any group could do the job more efficiently than the group normally undertaking it.
The intermediate-sized ants that normally perform. this task proved to be the most efficient for their energy costs, but when the scientist examined the whole set of jobs performed by each group of ants it appeared that some sizes of worker ant were not ideally suited to the particular jobs they performed.
In which way are the ants different from other non-human societies？
听力原文：W: I'm thinking about transferring out of state college into another school in the spring.
M: After a year and a half？ How come？ I thought you liked it here.
W: I do. But our commercial art department doesn't give Bachelor's degrees, only associate. I want a Bachelor's.
M: So where do you want to go？
W: I wouldn't mind going to Westwater University. It has an excellent reputation for commercial art, but I have a feeling it's very selective.
M: But you've gotten grades in the three semesters you've been in the state college, haven't you？
W: Yeah, mostly As and Bs.
M: So what are you worded about, just ask your professor to write letters of recommendation for you, and you'll be set.
(20)
风管系统的制作技术对板材拼接的要求中，不锈钢板厚度小于或等于()mm时，板材拼接可采用咬接。
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