2010高考英语完形填空专题训练
（1）
Do you find getting up in the morning so difficult that it’s painful? This might be called 21 , but Dr. Kleitman has a new 22 . He has proved that everyone has a 23 energy cycle. During the hours when you 24 through your work you may say that you’re “hot”. That’s 25 . The time of day when you feel most 26 is when your cycle of body temperature is at its peak.
