【正文】 es often worked together.11. What does the professor imply when he says this:A. He agrees with Chapman about opera and society.B. He thinks Chapman’s approach to opera is confusing.C. He is concerned that Chapman’s ideas are often misunderstood.D. He thinks Chapman’s questions are difficult to answer.第六篇 Environmental science12. What is the lecture mainly about?A. An efficient solution to the problem of storing solar energy.B. Energy policies in the twentieth century.C. Reasons that solar energy is not more widely used.D. The superiority of solar energy to oil and natural gas.13. What are the two main problems solar power presents as an energy source?Click on two answersA. It is a potentially dangerous source.B. It is difficult to concentrate.12C. It is scientifically unsound.D. It needs to be stored.14. According to the professor, what led to the popularity of solar energy in the 1970’s?A. New solar energy technologies.B. Advertising campaigns by solar energy panies.C. An increase in the price of oil and natural gas.D. The depletion of Earth’s reserves of oil and natural gas.15. What is the difference between passive and active heating systems?A. Passive systems are less reliable.B. Passive systems are difficult to install.C. Passive systems can be used at any location.D. Passive systems work without mechanical support.16. What is the professor’s opinion about the future of Kramer Junction power plant?A. He is uncertain about the future of the Kramer Junction plant.B. He believes the Kramer Junction plant will bee a major source of power.C. He is certain the Kramer Junction plant will not be able to increase its capacity.D. He thinks the Kramer Junction plant will have many petitors.17. What does the professor mean when he says that:A. He thinks the student should know the answer.B. He thinks the student has raised an important issue.C. He wants the student to repeat his question.D. He will answer the question later in the lecture.S1:15 CBADA 610 DBCAB 1117 CACDBAS2:15 BCBDA 610AC/BCDB 1117 AC/BD/CDABConversation1NarratorListen to a conversation between a student and a professor.StudentSo Professor Tibets, your notes said that you want to see me about my heavyweight paper. I have to say that grade wasn’t what I was expecting. I thought I’d done a pretty good job.ProfessorOh, you did. But do you really want to settle for pretty good when you can do something very good?StudentYou think it can be very good? ProfessorAbsolutely!StudentWould that mean you’d…I could get a better grade?ProfessorOh, sorry! It’s not for your grade. It39。 it is sort of like the plastic tip on each end of shoelace. It means not help you tie your shoe but that little plastic tip keeps the rest of the shoelace, the shoe string from unraveling into weak and useless threads. Well, the telomere at the end of Chromosomes seems to do about the same thing protect the genes the genetically functional parts of the Chromosome from being damaged. Every time the Chromosome divides, every time one cell divides into two. Pieces of the ends of the Chromosome, the telomere, get broken off. So after each division, the telomere gets shorter and one of the things that may happen after a while is that pieces of the genes themselves get broken off the Chromosomes. So the Chromosome is now losing important genetically information and is no longer functional. But as long as the telomeres are at certain length they keep this from happening. So it seems that, when the, by looking at the length of the telomeres on specific Chromosomes we can actually predict pretty much how long certain cells can successfully go on dividing. Other some cells just seem to keep on dividing regardless which mean not be always a good thing if it gets out of control.But when we analyze the cells chemically we find something very interesting, a chemical in them, and an enzyme called telomerase. As bits of the telomere break off from the end of Chromosome, this chemical, this telomerase can rebuild it, can help resemble the protected DNA, the telomere that the Chromosome is lost. Someday we may be able to take any cell and keep it alive functioning and reproducing itself essentially forever through the use of telomerase. And in the future we may have virtually immortal nerve cells and immortal skin cells of whatever because of these chemical, telomerase can keep the telomere on the ends of Chromosomes from getting any shorter.Lecture 2NarratorListen to part of a lecture in a Business ClassProfessorOk, as we’ve talked about a key aspect of running a successful business is knowing, um, getting a good sense of what the customer actually wants, and how they perceive your product. So with that in mind, I want to describe a very simple method of researching customer preference, and it is being increasingly mon, it39。s a great way to discover for yourself, how your product is perceived, what the strengths and weaknesses are, you know, how to you can improved it that sort of thing, you know Dortans, they make soup and can vegetables and such. Well, the head of the pany, had Dortans’ topped executives walk around supermarkets, um, asking shoppers what they thought of Dortans’ soup, and he use the data to make changes to the pany39。s cloths. Now that give them a very different idea about their product, they saw how people responded to it。s.. It39。 he see how the trash was sometimes, um, not pick up but off side the street and then they go back to the office and they write these memos, and these memos to stuff about the problems he had seen, and how they needed to be fixed, you know that sort of thing, but the thing is he got all the information just by going around and seeing the different Botamore neighborhoods and talking to the people in them, and he called it small politics, we