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.
This passage is about ______.

A．the sun
B．light and heat
C．the source of nuclear energy
D．X-ray

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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. This passage is about ______. 您的浏览器不支持 audio 元素。