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are doubtful. One South African woman claimed that she lived for 102 days on nothing but water and soda water. living There are great differences among living things in the ability to survive without food. For example, a tick, which lives on animals, may Warmsurvive a whole year. Warm-blooded animals use up their stores of food in the body more quickly. In fact, the smaller and more active the animal, the more quickly it uses up its reserves. A small bird starves to death in about five days, warma dog in about twenty. In general, we can say that a warm-blooded creature will die when it has lost about half its normal weight. This matter of weight is important. Man and other creatures live important. equilibrium(新陈代谢平衡) in a state of metabolic equilibrium(新陈代谢平衡) which means maintaining the body weight once a certain point has been reached. This regulation of body weight is done by thirst, hunger, and appetite. When your blood lacks nutritional materials, this registers in the brain hungry” hunger center of the brain and you feel “hungry”. The body is crying out for any kind of fuel (food). And it is our appetite that sees to it that we choose a mixed diet, which is the kind the body needs.( CACDC) fast” ( )72.The word “fast” in paragraph 1 can best be replaced by _______A__. _______A__. A eat no food B live merely on water and soda water C live on nothing D remain alive for a long time without food ( )73.A tick can survive much longer than a bird because ___C______. A a tick lives on animals B a tick is much smaller C a bird is more active D both B and C ( )74.A person feels hungry ___D______. doesn’ A if he doesn’t choose a mixed diet B because his body cries out for food regulation C when something is wrong with the regulation of body weight D if there are not enough nutritional materials in his blood ( )75.From the passage we can infer that the author ______C_____. A believes the South African woman very firmly African B does not believe the South African woman at all

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