环境科学
TPO36-L1 Potential Energy Source Helium-3
Listen to part of a lecture in an environmental science class.
- What is the lecture mainly about?
- A. The role of fossil fuels as an energy source in the future.
- B. Reasons for research into alternative energy sources.
- C. The feasibility of using a potential energy source.
- D. Causes of probable future energy problems.
- Why does the professor mention that the Moon lacks a magnetic field?
- A. To point out the danger inherent in mining for helium-3 on the Moon.
- B. To point out a flaw in the theory that helium-3 can be found on the Moon’s surface.
- C. To explain why it was difficult for astronauts to detect helium-3 on the Moon.
- D. To explain why it is likely that there are large amounts of helium-3 on the Moon.
- According to the professor, what potential advantages does helium-3 have as an energy source?
[CHOOSE 2 ANSWERS]
- A. A relatively small amount of it may provide very large amounts of energy.
- B. It is less likely to cause environmental problems than other energy sources are.
- C. It can be used in both nuclear fusion and nuclear fission reactors
- D. The infrastructure required for it to be used as a fuel source is not complex.
- What is the professor’s opinion of the potential of helium-3 as an energy source?
- A. Mining helium-3 on the Moon will eventually be easy
- B. Continuing to extract helium-3 from the Moon is not worthwhile.
- C. Helium-3 will probably be a significant energy source within a few years.
- D. Using helium-3 on a large scale will not be practical until nuclear fusion reactors are built.
- Why does the professor mention digging a crater to find gold?
- A. To explain why many scientists are interested in new missions to the Moon.
- B. To explain why helium-4 is more common on Earth than helium-3.
- C. To explain why extracting helium-3 from lunar soil may not be practical.
- D. To explain why scientists have looked for helium-3 in unusual places.
- What does the professor mean when he says this: 🎧
- A. Scientists are skeptical about the likelihood of a nuclear fusion plant being built.
- B. Scientists are aware that a nuclear fusion plant is about to be built.
- C. Scientists have been reluctant to support the building of a nuclear fusion plant.
- D. Scientists only started believing in the possibility of nuclear fusion in recent years.
答案：
C D AB D C A
