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Questions 11-13 are based on the following monologue introducing the Curies. You ,now have 15 seconds to read Questions 11-13.

When were the first x-rays discovered |A] In 1894. [B] In 1895. [C] In 1904. [D] In 1911.

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单项选择题

单项选择题

Questions 11-13 are based on the following monologue introducing the Curies. You ,now have 15 seconds to read Questions 11-13. 您的浏览器不支持 audio 元素。