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外购材料、配件、线缆只需(53)签字后就能在工程上使用或安装，承建单位即可进行下一道工序。
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Stack is quite simple. Many computer systems have stacks built into their circuitry. They
A．He had planned to attend Jason's presentation but couldn't.B．He preferred Jason's pr
听力原文：W: Hi, Larry, are you waiting to see Professor Jamason, too？
M: Yah, since I got one of the five highest grades in her managerial economics class, she asked me if I'd be interested in working as her assistant next semester. I'm here now for my interview.
W: Oh, yes, I know all about that job. I did it two years ago.
M: Really？ Did you like it？
W: I think it was file best job I've had at school. It paid eight dollars an hour, which was three dollars an hour more than I got working at the school post office the year before.
M: Wow! That is good salary. What did you do？
W: I was in charge of grading all the problem set that were assigned as homework. I never had trouble doing it, and of course, Prof. Jamason was always available to help me if I had any questions.
M: I think I'd enjoy doing that sort of work. It would be very good experience for anyone thinking about becoming a teacher.
W: Absolutely. You also learn how to use the computer data base, because the records are kept on it, and building up your computer skills is a good preparation for lots of jobs.
M: The job sounds great, but I'm a little worried about how much time it might take？
W: It's pretty reasonable. It never took me more than five hours a week to do the grading and then anoth cr thirty to forty minutes to record the grades on the computer.
M: That sounds managable. I guess you can do the work when it fits into your own schedule, too, can't you？
W: Oh, yah, you can do the grading in your room or in the library. You just need to get each set back for the next class, but that means you always have at least two days and sometimes four.
M: It sounds great.
W: Good luck with your interview.
(23)
deposits of clay. Look at cuts where highways have been built to see exposed clay beds; or
look at a construction site, where pockets of clay may be exposed. Rivers also reveal clay
along their banks, and erosion on a hillside may make clay easily accessible.
(5) What is clay made oF The Earth's surface is basically rock, and it is this rock that
gradually decomposes into clay. Rain, streams, alternating freezing and thawing, roots of
trees and plants forcing their way into cracks, earthquakes, volcanic action, and glaciers-all
of these forces slowly break down the Earth's exposed rocky crust into smaller and smaller
pieces that eventually become clay.
(10) Rocks are composed of elements and compounds of elements. Feldspar, which is the
most abundant mineral on the Earth's surface, is basically made up of the oxides silica and
alumina combined with alkalies like potassium and some so-called impurities such as iron.
Feldspar is an essential component of granite rocks, and as such it is the basis of clay.
When it is wet, clay can be easily shaped to make a variety of useful objects, which can
(15) then be fired to varying degrees of hardness and covered with impermeable decorative
coatings of glasslike material called glaze. Just as volcanic action, with its intense heat,
fuses the elements in certain rocks into a glasslike rock called obsidian, so can we apply
heat to earthen materials and change them into a hard, dense material. Different clays need
different heat levels to fuse, and some, the low-fire clays, never become nonporous and
(20) watertight like highly fired stoneware. Each clay can stand only a certain amount of heat
without losing its shape throughsagging or melting. Variations of clay composition and the
temperatures at which they are fired account for the differences in texture and appearance
between a china teacup and an earthenware flowerpot.
The author's main point in paragraph 1 is that clay deposits
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