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C

解析 见第二段第二句。
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