专题5 阅读理解_5

（广东省深圳市2016年高三第二次调研）阅读理解。
 
Humans and many other mammals have unusually efficient internal temperature regulating systems that automatically maintain stable core body temperatures（核心体温）in cold winters and warm summers. In addition, people have developed cultural patterns and technologies that help them adjust to extremes of temperature and humidity（湿度）.
 
In very cold climates, there is a constant danger of developing hypothermia（低体温）, which is a life threatening drop in core body temperature to below normal levels. The normal temperature for humans is about 37.0°C. However, differences in persons and even the time of day can cause it to be as much as 6°C higher or lower in healthy individuals. It is also normal for core body temperature to be lower in elderly people. Hypothermia begins to occur when the core body temperature drops to 34.4°C. Below 29.4°C, the body cools more rapidly because its natural temperature regulating system usually fails. The rapid decline in core body temperature is likely to result in death. However, there have been rare cases in which people have been saved after their temperatures had dropped to 13.9-15.6°C. This happened in 1999 to a Swedish woman who was trapped under an ice sheet in freezing water for 80 minutes. She was found unconscious, not breathing, and her heart had stopped beating, yet she was eventually saved despite the fact that her temperature had dropped to 13.7°C.
 
In extremely hot climates or as a result of uncontrollable infections, core body temperatures can rise to equally dangerous levels. This is hyperthermia. Life threatening hyperthermia typically starts in humans when their temperatures rise to 40.6-41.7°C. Only a few days at this extraordinarily high temperature level is likely to result in the worsening of internal organs and death.
 
【小题1】Why can humans keep stable body temperatures in different seasons?A．Because their bodies are unusually efficient.B．Because they experience different climates.C．Because they can adjust to cultural patterns and technologies.D．Because they have internal temperature regulating systems.【小题2】What does Paragraph 2 mainly discuss?A．The dangerous effects of hypothermia.B．The change of body temperature.C．The survival of the Swedish woman.D．The regulating systems of natural temperature.【小题3】People are unlikely to survive under the body temperature .A．higher than 34.4°CB．lower than 29.4°CC．between 40.6-41.7°CD．between 34.4-37°C【小题4】What is the best title for the passage?A．Surviving in an ice trapB．Getting to know hypothermiaC．Adapting to climate extremes D．Changing core body temperature