阅读下面短文，掌握其大意，然后从1—10各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
Do you find getting up in the morning so difficult that it’s painful? This might be called 1 , but Dr. Kleitman has a new 2 . He has proved that everyone has a 3 energy cycle. During the hours when you 4 through your work you may say that you’re “hot”. That’s 5 . The time of day when you feel most 6 is when your cycle of body temperature is at its peak. For some people the 7 comes during the forenoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it 8 such familiar monologues as: “Get up, John! You’ll be late for work again!” The possible explanation to the trouble is that John is at his temperature-and-energy peak in the 9 . Much family quarrelling ends when husbands and wives 10 what these energy cycles mean, and which cycle each member of the family has. You can’t change your energy cycle, but you can learn to make your life fit it better.
