单选题
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 andC.
【正确答案】
D
【答案解析】
原文中有“scientists hope to be able to manipulate sleep in order to control the way people feel and perform”—句。
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