第三节 语法填空( 共10题；每小题1.5分，满分15分）
Water is one of your most urgent needs in a survival situation. You can’t live long 31 it, especially in hot areas, 32 you lose water rapidly through perspiration(流汗). Even in cold areas, you need a minimum of 2 liters of water each day to keep your body going. Water helps keep up your body temperature, oil your organs, break down body fat 33 digest the food you eat. 34 you do not take in enough water, your body will begin pulling it from other places, including your blood. When water is removed from your blood, the blood thickens, making it 35 (difficult) than usual for the heart to pump blood through your body. You become tired, lack energy, and will be unable to function properly.
More than three-fourths of your body 36 (make) up of liquids. Your body loses water because of heat, cold, stress, and hard work. To function 37 (effective), you must replace 38 water your body loses. So, one of your first goals is 39 (obtain) an adequate supply of water and to do that, you must find a water source or build a water container to collect water. Then the water must be made clean before 40 is safe to drink.
16. without; 17. where; 18. and; 19. If; 20. more difficult; 21. is made; 22.effectively; 23. the; 24. to obtain; 25.it