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单选题
The writer thinks the most important use of the laser is in the field of ______.
A
medical treatment
B
national defense
C
space travel
D
metrology
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参考解析
解析：
细节题。关键句：原文第四段第一句话“Probably the most vital application of the laser is in the field of medicine．”可知，激光最重要的应用是在医药领域，故正确的答案为A。
细节题。关键句：原文第四段第一句话“Probably the most vital application of the laser is in the field of medicine．”可知，激光最重要的应用是在医药领域，故正确的答案为A。
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