A. The use of a new tool as a surgical instrument. B. The cost of an operation. C. The prospect of surgical future with the help

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问题 A. The use of a new tool as a surgical instrument.
B. The cost of an operation.
C. The prospect of surgical future with the help of laser.
D. The usage of laser.
E. How laser functions.    F. The advantage of laser.
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选项

答案E

解析 第二段意为:激光是如何发挥用处的。
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