Thousands of years ago man used handy
rocks for his surgical operations. Later he used sharp bone or horn, metal
knives and, more recently, rubber and plastic. And that was where we stuck, in
surgical instrument terms, for many years. In the 1960s a new tool was
developed, one which was, first of all, to be of great practical use to the
armed forces and industry, but which was also, in time, to revolutionize the art
and science of surgery.
The tool is the laser and it is, being
used by more and more surgeons all over the world, for a very large number of
different complaints. The word laser means: Light Amplification by Stimulated
Emission of Radiation. As we all know, light is hot; any source of light--from
the sun itself down to a humble match burning--will give warmth. But light is
usually spread out over a wide area. The l
A. medical help became available to industrial workers
B. the study of surgical techniques went through a complete revolution
C. more and more surgeons began using surgical instruments
D. man’s whole approach to surgery changed completely
[单项选择] Passage One
Thousands of years ago man used handy
rocks for his surgical operations. Later he used sharp bone or horn, metal
knives and more recently, rubber and plastic. And that was where we stuck, in
surgical instrument terms, for many years. In the 1960s a new tool was
developed, one which was, first of all, to be of great practical use to the
armed forces and industry, but which was also, in time, to revolutionize the art
and science of surgery.
The tool is the laser and it is being
used by more and more surgeons all over the world, for a very large number of
different complaints. The word laser means: Light Amplification by Stimulated
Emission of Light. As we all know, light is hot; any source of light ——from the
sun itself down to a humble match burning ——will give warmth. But light is
usually spread out over a wide area. The lig
A. fashionable
B. extraordinary
C. special
D. basic
[单项选择]Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bones or horns, metal knives and more recently, rubber and plastic. In the 1960s a new tool was developed, one which was, first of all, to be of great practical use to the armed forces and industry, but which was also to revolutionize the art and science of surgery.
The tool is the laser and it is being used by more and more surgeons all over the world. As we all know, light is hot, and any source of light will give warmth. But light is usually spread out over a wide area. The light in a laser beam, however, is concentrated. This means that a light with no more power than that produced by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.
Experiments with these pinpoint beams showed researchers that different energy sources produce beams that have a particular effect on certain living cells. It is now possible for eye surgeons to o
A. Traditional.
B. Complicated.
C. Remarkable.
D. Revolutionary.
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