The Laser: A Scientific & Technological Wonder
The Laser: A Powerful Tool for Communications
The Laser: A Solution to Life-Saving Problems
The Laser: A Multimillion Dollar Invention
第1题：
A.dangerous
B.coherent
C.mysterious
D.numerous
第2题：
A. lower cost
B. higher chirp
C. easier to manufacture
D. higher dispersion tolerance
E. higher optical signal-to-noise ratio
第3题：
A.to
B.on
C.at
第4题：
Which of the following stages in the laser print process attracts toner to the latent image on the photoconductor？（）
第5题：
Based on the laser operation treatment of three patients。what can we infer from the passage?
A．Laser light treatment is safe and effective．
B．Laser light treatment is dangerous and ineffective
C．Laser light treatment still requires much more studies．
D．Government should encourage doctors to do research of laser light treatment on the human body．
第6题：
A.inkjet
B.thermal
C.impact
D.laser
第7题：
Why do the American doctors think of using laser light to treat heart disease?
A．Beeause laser light is quite powerful．
B．Because laser light is penetrating．
C．Because laser light can destroy the blocking materials in human’s artery．
D．Because laser light can travel through the human body．
第8题：
No more than twenty years passed ( ) laser was first invented.
A、after
B、since
C、before
D、when
第9题：
What’S the main idea of the passage7
A．Laser light treatment of heart disease should take the place of the traditional operatlon．
B．Laser light treatment has been proved better and more effective than the traditional operation．
C．More advanced technology should be encouraged to try on．
D．Laser light treatment of heart disease still needs’more research．
第10题：
What is an advantage of an externally modulated laser over a directly modulated laser?（）