题目内容：
Based on the laser operation treatment of three patients。what can we infer from the passage?
A．Laser light treatment is safe and effectiv B．Laser light treatment is dangerous and ineffective ┠考试大^o^在线^*^考试中心┨
C．Laser light treatment still requires much more studie
D．Government should encourage doctors to do research of laser light treatment on the human bod
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