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 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．

　　51．If we know our natural body rhythm well, we can

　　．

　　A．find out the suitable time to do specific tasks

　　B．organize our time around work demands

　　C．do whatever our body feels like doing

　　D．be sure to be healthy

　　52．Which of the following is NOT true?

　　A．Our alertness is influenced by our natural body rhythm

　　B．Doing whatever your body feels like is very difficult in our modem society．

　　C．Obeying our body clock is good for our health．

　　D．Disrupting our natural body rhythm can lead to obesity．

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