阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第1—4段每段选择1个正确的小标题；(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每个句子。 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 (腓尿), 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 airplane, 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. Paragraph 2______