Directions: In this section of the test, there are ten paragraphs. Each of the paragraphs is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Spell out the missing letters of the word on your Answer Sheet.
Paragraph One
When you lose an hour of sleep, it decreases your well-being, productivity, health, and ability to think the following day. One of the most influential studies of human performance found that top performers slept 8 hours and 36 minutes per day. You are simply a different person when you operate on insufficient sleep.
Insufficient sleep may lead to p____ performance.
【正确答案】：poor
