问题详情：
While the nature is waking up in spring, our bodies may not respond the same way. Many of us may share the feeling of spring sleepiness. Although it is not an illness, the following tips might be essential for those who need to stay awake.
1. Don't sleep more, exercise more
21 . Getting longer sleep may reduce activities, making people sleepier. Instead, slightly increase the level of your physical activities, which help to send more oxygen to the brain, making us feel awake and energetic.
2. Fight back with caffeine but do not overdose
A certain amount of caffeine is good for the health, and can keep us alert for important occasions. However, too much coffee may accelerate heart problems.
3. More fruits, and less greasy foods
22 . To feel light and alert, eat more food that is rich in vitamins, such as citrus and lemon and alkaline foods, such as fresh vegetables. Greasy foods and alcohol will have the reverse effect.
4. Splash cold water on your face
If a cup of coffee doesn't keep you awake long enough, try splashing cold water on face is always refreshing. 23 .
5. Get some fresh air
24 . Bad air flow will lead to insufficient oxygen, which will affect the brain's performance. Also go outdoors to get close to nature.
6. Drink enough water
Try to always have a bottle of water next to you, as it can help to eliminate accumulated toxins and help to fight spring fatigue. 25 .
A. You can also add slices of lemon to make it vitamin-rich.
B. Eight hours of sleep is usually enough for adults
C. Also try brushing your teeth with mint-scented toothpaste, or use mouthwash.
D. Aerobic exercise, such as jogging, swimming and rope skipping, are recommended.
E. Try placing a pot of fresh mint or basil on your office desk
F. Modern research finds that sleepiness in spring is usually accompanied by insufficient vitamins.
G. Make sure that air flows properly in your office and bedroom.
【回答】
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