本文整理的内容是2017年5月27日托福听力机经小范围预测。托福听力材料中每篇对话2-3分钟,讲座5-6分钟,文章很长,因此适当的记笔记能帮助我们记录听力中的重点,希望可以给大家备考提供更多指导!

  1. What is the lecture mainly about?

  (A) Ways to generate heat for nuclear fusion

  (B) Differences between nuclear fission and nuclear fusion

  (C) A controversial theory regarding how to generate nuclear fusion

  (D) The possibility of establishing sustained nuclear fusion

  2. According to the students, what are three advantages of nuclear

  fusion over nuclear fission

  Click on 3 answers.

  (A) Nuclear fusion can use a fuel that is more easily obtained.

  (B) Nuclear fusion can be achieved at lower temperatures.

  (C) Nuclear fusion produces more energy.

  (D) Nuclear fusion does not produce hazardous by-products.

  (E) Nuclear fusion does not require as many natural resources.

  3. Why does the professor mention isotopes of hydrogen?

  (A) To correct a student's comment about how fusion takes place in stars

  (B) To help answer a student's question about temperature requirements

  for fusion reactors

  (C) To explain what happens to hydrogen atoms during fusion reactions

  (D) To justify the need for superconducting magnets in nuclear fusion

  reactors

  4. According to the professor, how will the ITER reactor differ from

  earlier experimental fusion reactors?

  Click on 2 answers.

  (A) It will be transportable to different locations.

  (B) It will sustain nuclear reactions through heat that it generates on its

  own.

  (C) It will heat the fuel mixture to a higher temperature.

  (D) It will confine the plasma in a more energy-efficient way.

  5. What does the professor say about the international effort to

  develop ITER?

  (A) The participation of many countries may cause ITER to be delayed

  even more.

  (B) The research orientation of ITER has encouraged international

  collaboration.

  (C) ITER will make use of equipment made in many different countries.

  (D) The lack of international cooperation on earlier fusion projects has

  hurt ITER.

  6. What does the professor imply when he says this:

  (A) He prefers to work on projects with more immediate results.

  (B) He believes that research in the physical sciences requires strict time

  lines.

  (C) He thinks it will take less time to develop ITER than most researchers

  expect.

  (D) He is more skeptical about the future of nuclear fusion than most

  researchers are.

  根据以上智课网给大家提供的2017年5月27日托福听力机经小范围预测,希望可以帮助大家顺利备考!


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