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.
Now listen to the passage.

What do the scientists hope to do in the future A. Reduce sleep. B, Control the way people feel. C. Control the way people perform. D. Both B and C.

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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. Now listen to the passage. 您的浏览器不支持 audio 元素。