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A．He has stolen the thrown away pills.B．He practiced medicine without a license in Afr
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A．The active volcanoes in the Antarctic.B．The icebergs and volcanoes around the world.
听力原文：M: I think I've got this experiment set up right now.
W: You only think it's right？ In chemistry, you've got to be sure.
Q: What does the woman imply？
(17)
听力原文： Plastic bags can be found almost everywhere around us. (30)According to. the American Plastics Council, 80 percent of groceries are packed in plastic bags. The numbers are absolutely surprising. It is estimated that consumers use between 500 billion and one trillion plastic bags per year all over the world. Plastic bags can be found in landfills, stuck on trees, and floating in the ocean.
Some experts say that plastic bags may harm the environment. It may take hundreds of years for plastic bags to break down. As they break down, they will release poisonous materials into the water and the soil. (31)Plastic bags in the ocean can choke wildlife. Endangered sea turtles eat the bags and often choke on them—probably because the bags look like its favorite food. In fact, floating plastic bags have been spotted from as far north as the Arctic Ocean to as far south as the southern end of South America. One expert even gives a prediction that within ten years, plastic bags will wash up in Antarctica!
While some experts have argued for placing a heavy tax on plastic bags, others worry that the tax would cause people who make plastic hags to lose jobs. Some people also worry that making plastic bags more expensive would increase landfill waste because stores would start using paper bags again. Another possible solution would be to use plastic bags that can be easily broken down, a technology that has recently improved. (32)Perhaps the simplest solution for now, however, is to pack groceries in reusable bags.
(31)
听力原文：W: Hi, Larry, are you waiting to see Professor Jamison, 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(22).
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(23).
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(25). I never had trouble doing it, and of course, Prof. Jamison 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(24)？
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.
M: That sounds manageable. I guess you can do the work when it fits into your own schedule, too, can't you？
W: Oh, yeah, 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.
(26)
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