When the body clock can synchronize (使……同步) the rhythms of its natural processes, it “gives us an advantage in daily life”, says Key.

　　According to him, when it comes to cognitive (认知的) work, most adults perform best in the late morning. As our body temperature starts to rise just before awakening in the morning and continues to increase until midday, our memory, alertness and concentration gradually improve.

　　However, he adds, our ability to concentrate typically starts to decrease soon thereafter. Most of us are more easily distracted (分心) between noon and 4 pm.

　　Alertness also tends to fall after eating a meal and sleepiness tends to peak around 2 pm, making that a good time for a nap.

　　Surprisingly, tiredness may increase our creative powers. For most adults, problems that require open-ended thinking are often best dealt with in the evening when they are tired, according to a study in the journal Thinking & Reasoning. When choosing a time of the day to exercise, paying attention to your body clock can improve results. Physical performance is usually best from about 3 to 6 pm, says Michael Smolensky, a professor of biomedical engineering. Of course, not everyone’s body clock is the same, making it even harder to synchronize natural rhythms with daily plans.

　　32．If we know our natural body rhythm well, we can ______.

　　A. find out the suitable time to do specific tasks

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