共用题干
The Drink Your Body Needs Most

1 Our bodies are estimated to be about 60% to 70% water.Blood is mostly water,and
our muscles,lungs,and brain all contain a lot of water.Water is needed to regulate body
temperature and to provide the means for nutrients（滋养物）to travel to all our organs.
Water also transports oxygen to our cells,removes waste,and protects our joints and
organs.
2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If you
are very active,you lose more water than if you do not take much exercise.Symptoms of
mild dehydration（脱水）include chronic pains in joints and muscles , lower back pain,
headaches, and constipation（便秘）.A strong smell to your urine , along with a yellow
color indicates that you are not getting enough water.Thirst is an obvious sign of
dehydration and in fact,you need water long before you feel thirsty.
3 A good rule of thumb（好的做法）is to take your body weight in pounds and divide that
number in half. That gives you the number of ounces（盎司）of water per day that you
need.For example,if you weigh 160 pounds,you should drink at least 80 ounces of water
per day.If you exercise you should drink another 8-ounce glass of water for every 20 minutes you are active.If you drink coffee or alcohol,you should add at least an equal
amount of water.When you are traveling on an airpiane,it is good to have 8 ounces of
water for every hour you are on board the plane.
4 It may be difficult to drink enough water on a busy day.Be sure you have water handy at
all times by keeping a bottle for water with you when you are working,traveling,or
exercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.There
are some brands of flavored water available,but some of them have sugar or artificial
sweeteners that you don't need.

Dehydration may occur if there is a shortage of water__________.
A:in your body
B:without water
C:before long
D:for a change
E:on a busy day
F:to your weight