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    49. The young trees are  every day.

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                                            C 

           What time of day can you think most quickly? Are you a morning person? Or does it take you a few hours to get your brain (脑) going? A lot of recent research suggests that we should pay attention to our body clock. It can tell us what time of day we can perform best at.

           Many people work best later in the morning. This is because the body's temperature takes time to rise through the day. Taking a warm shower when you wake up can help your bodys temperature rise quickly.

           But everyone’s  body clock is different and some are special. Morning people will get up early and work better early in the day. Evening people will work later but work better towards the end of the day.

           Research shows that we’re better at some activities at certain times of the day. Physical performance (体能) is at its best between 3 pm and 6 pm ,so it’s better to exercise later in the day.

           Between noon and 4 pm,people begin to pay less attention. This is because we think less quickly after a big meal. RevSearch also shows we become sleepy around 2 pm. This is why people in Spain take a short vsleep in early afternoon.

           Finally,it is best to eat when we’re active. This allows our body to burn calories (卡路里) better and stops our blood sugar levels (血糖) from getting too high.

    () 36. can tell us what time of day we can perform best at.

       A. Morning people         B. A warm shower

       C. Our body temperature   D. Our body clock

    () 37. A morning person will .

       A. get up late but work better      B. work better early in the day

       C. only work in the early morning   D. go to bed late every night

    () 38. What is the best time for physical performance?

       A. Between 3  pm and 6 pm.   B. Between 7  pm and 10 pm.

       C. Between noon and 4 pm.    D. Between 5  am and 8 am.

    () 39. Why is it best to eat when we’re active?

       A. Because eating makes the brain unable to think quickly.

       B. Because it makes our blood sugar levels higher.

       C. Because our body can burn more calories.

       D. Because our body needs a short sleep.

    () 40. What is the best title for this article?

       A. How Can We Work Better?  B. The Best Time to Exercise

       C. How Can We Keep Healthy? D. The Perfect Time to Do Something

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       A. if   B. unless   C. when   D. since

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