今天2017年6月25日大范围预测，关于托福听力备考，有许多需要注意的细节问题，比如说考生需要一边听力一边找到关键词，注意考前试音等等。
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.
以上的资料内容是2017年6月25日托福听力机经大范围预测，希望会给正在备考的同学们提供更多指导。