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英语专八考前自测冲刺题:改错上

2006-07-04 13:11

  本文是英语专业八级考试中的改错题型,供考生在考试前做自我测试之用。

  We've all used thermometers to measure temperature

  but sometimes we need to measure temperature in places you (1) __

  can' t put a thermometer —— for example, inside a rocket engine.

  One of the best methods for those really hard-to-get-to

  place is based on laser spectroscopy. Light from a laser point- (2) __

  ing at the region of interest is absorbed by molecules and some (3) __

  of it are re-emitted back towards the source where it can be (4) __

  measured. The re-emitted fight is shifted in frequency (changed

  in wavelength) by amounts that depend on the molecule and

  also the temperature and pressure of the surrounding gas be- (5) __

  cause of collisions among the molecules. The single, sharp

  frequency from the laser is thus smeared out into a whole

  spectrum of frequency whose shape can be used to determine (6) __

  the temperature provided so that the molecular transitions and (7) __

  line shapes are known. Because it is the main component of

  the air, it is convenient to use nitrogen since its molecular (8) __

  properties are known from room temperature to temperature

  of about 1,200 degree Celsius from experimental measurements. (9)

  Although this is a large range, it is far short of what it is needed (10) __

  for, some applications.

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