It has been a primary plot design in science fiction TV programs and movies to allow objects like spaceships to be trapped in a line of light But Dr Cizmar said this particular technique would not eventually lead to that A transfer of energy happens in the process

　　On a microscopic level that is OK. but on a large level it would cause huge problems

　　A large object　could be destroyed by the heating, which results from the massive amount of energy necessary to pull it.

　　24. What is this passage mainly about?

　　A The application of light control techniques in modem society.

　　B The uses and limitations of a scientific invention by a research team

　　C. The adoption of light control techniques in medical treatment.

　　D. The influences and effects of scientific developments on science fiction

　　25. Which of the following is TRUE about Dr Cizmar's tractor beam?

　　A It moves big objects as the tractor beam did in Star Trek.

　　B It is the first beam that pushes objects forward

　　C. It relies on negative force to pull out specific kinds of particles.

　　D. It is currently being used for separating blood cells in medical research

　　26. What does "that" in the last paragraph refer to?

　　A

　　Transferring a massive amount of energy.

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