問題詳情
第 40 至 43題為題組In science fiction TV programs such as Star Trek, tractor beams are used to tow spaceships andmove objects. For years, scientists have labored to replicate this feat. In 2013, they succeeded. A team ofBritish and Czech scientists, led by Dr. Tomas Cizmar, say they have created a real-life “tractor beam,”like the kind from Star Trek, which uses a beam of light to attract objects, at least at a microscopic level.Light manipulation techniques have existed since the 1970s, but this is thought to be the first time alight beam has been used to draw objects towards a light source. Usually when microscopic objects are hitby a beam of light, they are forced along the direction of the beam. After many years’ research, Dr.Cizmar’s team discovered a technique that allows for the radiant force of light to be reversed and to usethe negative force to draw out certain particles.Dr. Cizmar says that even though it is a few years away from practical use, the technology has hugepotential for medical research. In particular, the tractor beam is highly selective in the particles it canattract, so it can pick up particles that have specific properties, such as size or composition, in a mixture.“Eventually, this could be used to separate white blood cells, for example,” Dr. Cizmar told BBC News.It has been a primary plot device in science fiction TV programs and movies to allow objects likespaceships to be trapped in a beam of light. But Dr. Cizmar said this particular technique would noteventually lead to that. A transfer of energy happens in the process. On a microscopic scale that is OK,but on a large scale 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.
【題組】40. What is this passage mainly about?
(A) The application of lighting technology in modern society.
(B) The uses and limitations of a scientific invention by a research team.
(C) The adoption of light manipulation techniques in medical treatment.
(D) The influences and effects of scientific developments on science fiction.
參考答案
答案：B
難度：適中0.44
統計：A(4),B(11),C(4),D(4),E(0)