题目内容:
Why do the American doctors think of using laser light to treat heart disease?
A.Beeause laser light is quite powerfu ┠考试大^o^在线^*^考试中心┨ B.Because laser light is penetratin
C.Because laser light can destroy the blocking materials in human’s arter
D.Because laser light can travel through the human bod
参考答案:
答案解析: