What’S the main idea of the passage7

ALaser light treatment of heart disease should take the place of the traditional operatlon．
BLaser light treatment has been proved better and more effective than the traditional operation．
CMore advanced technology should be encouraged to try on．
DLaser light treatment of heart disease still needs’more research．

参考答案

参考解析：

通读全文，特别是最后一段后半部分，可知正确答案应是D项。

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