英语专八考前自测冲刺题：改错上

会计考友

　　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
/ @/ R; x9 e( b　　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
) }5 R3 k" K9 t+ q/ n$ \- z' r　　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
! m4 M+ O8 u: {7 w! N& R( D　　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） __
! D' i* v) Q' O+ \  z: p% K　　line shapes are known. Because it is the main component of
1 M3 A  M# N* r, y　　the air， it is convenient to use nitrogen since its molecular （8） __
2 P& r% ]3 x8 K- s　　properties are known from room temperature to temperature
( `7 A$ O. r! O6 g2 a. R2 ?" a　　of about 1，200 degree Celsius from experimental measurements. （9）
8 x+ u6 V& p8 v2 o% K- s9 m; ~　　Although this is a large range， it is far short of what it is needed （10） __
5 o- w; c9 B( G　　for， some applications.