第3部分：概括大意与完成句子（第23～30题，每题1分，共8分）
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个选取项中为第2～5段选择1个正确的小标题；（2）第27～30题材要求从所给的6个选项中选择4个正确选项，分别完成每个句子。请将答案涂在答题卡相应的位置上。
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 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.
