根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多途选项。

  Laser(激光)is short for Light Amplification by Stimulated Emission of Radiation.Laser light is different from daylight or electric lights.Industry put lasers to work almost immediately after they were invented in nineteen sixty.  1  

  The first medical operation using a laser took place the year following its invention.Doctors Charles Campbell and Charles Koester used a laser to remove a tumor from a patient's eye at Columbia-Presbyterian Hospital in New York City.  2  

  Lasers have made measurement an exact science.Astronomers have used lasers to measure the moon's distance from Earth.  3  .For example, drawing a perfectly level straight line on a construction site is easy using a laser.

    4  .And the jewelry industry uses lasers to write on the surface of the world's hardest substance, diamonds.

  Lasers are found in many products used almost everywhere.Over one hundred years ago, writers imagined that beams of light could be powerful weapons.Today, lasers guide missiles and bombs.American defense companies are working on giant laser guns recognizable to science fiction fans everywhere.  5  

  Scientific American magazine says huge lasers turn only about twenty to thirty percent of the energy they use into a laser beam.The rest is lost as heat.

  That has not stopped scientists from working to perfect powerful lasers that, one day, may be able to shoot missiles out of the sky.

A.But weapons were not the first to use it on the list.

B.All lasers have several things in common.

C.Mappers and builders use laser technology every day.

D.But there are technological difficulties.

E.Lasers have also changed the way we communicate.

F.Manufacturers have used lasers for years to cut and join metal parts.

G.Since then, doctors have used lasers to cut and remove tissue safely with little risk of infections.

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Have you ever seen any students whose trousers hang so low you can see their underwear? What do you think of that ? Fashionable? Some of today’s teenagers are big fans of such a look?    【小题1】
The headmaster of a school in central Italy has asked students to stop wearing low-rise jeans that expose underwear and parts of the body. His request came after a class trip. One day, he saw one boy’s baggy trousers slide to his feet.  【小题2】  .
But in Italy, a nation that takes fashion very seriously, the suggestion caused a debate among parents, teachers and students. The issue is whether the headmaster’s request will limit students’ freedom—or whether dress in Italian schools is too casual.
【小题3】 “we do not want to kick fashion out,” the headmaster explained, “ but extremes (极端)of fashion like this are not right in school.” Many other schools have now requested that their students also stop wearing such trousers.
【小题4】 Ludovica Gaudio,14, wore extremely low trousers exposing orange underwear in class. It was cold, so she wore a matching orange scarf.  【小题5】 “ I don’t really feel comfortable in those sort of jeans,” said Sarah Lattanzi, “In winter , when dressed like that ,it’s quite cold and I am afraid my stomach will ache.”

A.But recently this trend has been at the center of an argument in Italian middle schools.
B.A parents’ group praised the move in favor of good taste, while others advised schools to stop worry about fashion and fix up old school buildings.
C.He pointed out that this way of dressing is not suitable for school.
D.Most students have simply ignored the request.
E.Another 14-year-old girl said she would probably respect the request, simply for practical reasons.
F.Let us see that Italian students react differently to schools’ requests.
G.Schools should pay attention to things more important than students’ clothes.

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