Afterhavingaheavylunch,whenwecontinueourworkinoffice,we...

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问题详情：

After having a heavy lunch, when we continue our work in office, we tend to feel drowsy. It may strengthen so much that we find it difficult to keep our eyes open. At that time, many of us wish we could have a small bed next to our desks where we can take a rest! Sometimes, we even get a sense of guilt for fear that we may commit some mistakes in the work we are doing at that time. Some people may think that there must be something wrong with their health.

Usually, our lunch consists of heavy foods that make the stomachs full. So, most of the blood is directed towards the stomachs where the digestion is taking place. As a result, the brain receives much less amount of oxygen than it usually gets. This condition gives rise to drowsiness which is also accompanied by a sense of tiredness. During digestion of the foods, stomach acids are produced to help with digestion but they also change the pH values of the blood and make it alkaline(碱*的). Generally speaking, the pH values of the blood from 7.35-7.45 is normal. This alkalinity of blood can lead to the drowsy feeling. If you observe carefully, you will find that when you eat foods like pasta or bakery products, you tend to feel sleepier. These foods make the sugar levels in the blood higher than normal.

Thus we’d better make some changes on the foods that make up our lunch. Avoid potatoes, pasta, desserts and sweets, and eat less. Besides, we should stay away from drinks rich in caffeine, such as coffee. The fact is that it can make you think clearly only for a brief period of time. After that, you will start feeling sleepy all over again. Walking a few minutes after lunch is the best way to get rid of the drowsiness. This will improve the flow of blood in the body and will limit the blood sugar.

28. What does the underlined word “drowsy” in Para. 1 mean?

A. Sick. B. Weak. C. Sleepy. D. Impatient.

29. Why do we sometimes feel guilty after having a heavy lunch？

A. Because we can’t help worrying about our health.

B. Because we may drink lots of our company’s coffee.

C. Because we fear we may make mistakes in the work.

D. Because eating may take up our work time.

30. If a person eats too much, the pH value of his blood might be at ______.

A. 8 B. 7 C. 6 D. 5

31. By following the suggestions in the last paragraph, we could________.

A. get rid of our bad eating habits finally

B. improve our health without much effort