Paragraph EightOne of the most influential studies of human performance find that one less hour of sleep is not equal to an extra hour of achievement. In many cases the opposite occurs. When you lose an hour of sleep, it decreases your well-being, productivity, health, and ability to think the following day.Insufficient sleep, p_____ performance.
【正确答案】：poor
【题目解析】：本段的意思是睡眠不足会导致表现很糟糕。因此答案是poor。
