单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
The high-energy gamma radiation ______.

A．is released at the Earth’s Center
B．is a kind of long wavelength
C．is reemitted at slightly short wavelengths
D．is absorbed by atoms inside the Sun

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. The high-energy gamma radiation ______. 您的浏览器不支持 audio 元素。