In the second paragraph, the word "ratio" refers to ______.
A．minimum input divided by maximum output
B．given input divided by maximum output
C．output divided by input
D．money divided by output
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In the United States influenza is one of the ten principle causes of death.
A．Y
B．N
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Generally speaking, the person who catches flu can completely recover for at last 14 days.
A．Y
B．N
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听力原文：W: Hi, Larry, are you waiting to see Professor Gilmore, too?
M: Yah, since I got one of the five highest grades in her 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 the best 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: That is a good salary. What did you do?
W: I was in charge of grading all the problem sets that were assigned as homework. I never had trouble doing it, and of course, Prof. Gilmore 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 worded about how much time it might take.
W: It's pretty reasonable. It never took me more than five hours a week to do all the grading and then another thirty to forty minutes to record the grades on the computer.
(20)
A．She is a good friend of Professor Gilmore.
B．She used to work for Professor Gilmore.
C．She heard of it form. other students.
D．She arranges the job for Larry.
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听力原文：F: Hello! This is Prof Gates' office. I'm calling to remind you of your 4:15 appointment with the professor to discuss your term paper tomorrow.
M: Oh, thanks. It's a good thing that you called, I thought it was 4:15 today.
Q: What does the man mean?
(18)
A．He didn't make the appointment with the professor.
B．He totally forgets about the appointment.
C．He would probably go to the professor's office today if the woman didn't call him.
D．He though the appointment was 4:50.
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According to the passage, the processing of the new antibiotic and vaccines becomes an engineering problem when ______.
A．it involves the low-cost production of large quantities
B．these items originate in the work of biochemistry
C．people are engaged in safe operations in the test-tube stage
D．business agents use efficient methods to market these items