[单选题] 提问人:匿名网友 提问时间:2021-08-24

What is the main idea of the passage?


A .Roentgen discovered X-rays.
B .The usage of X-rays
C .An experiment made by Roentgen
D .The discovery of X-rays and its medical usage.

提问人:匿名网友 提问时间:2021-08-24

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