Heat Is Killer Extremely hot weather is common in many parts of the world. Although hot weather just makes most people feel

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问题                         Heat Is Killer
    Extremely hot weather is common in many parts of the world. Although hot weather just makes most people feel hot, it can cause serious medical problems-even death. Floods, storms, volcano eruptions and other natural disasters kill thousands of people every year. 46 Experts say heat may be nature’s deadliest killer. Recently, extreme heat was blamed for killing more than one hundred people in India. It is reported that the total heat of a hot day or several days can affect health. 47 Expels say heat waves often become dangerous when the nighttime temperature does not drop much from the highest daytime temperature. This causes great stress on the human body.
    48 Stay out of the sun, if possible. Drink lots of cool water. Wear light colored clothing made of natural materials; avoid wearing synthetic clothing. Make sure the clothing is loose, permitting freedom of movement. And learn the danger signs of the medical problems, such as headache and vomiting, that are linked to heat. 49 The pain is a warning that the body is becoming too hot. Doctors say those suffering headache or muscle pain should stop all activity and rest in a cool place and drink cool liquids. Do not return to physical activity for a few hours because more serious conditions could develop.
    Doctors say some people face an increased danger from heat stress. 50
    Hot weather also increases dangers for people who must take medicine for high blood pressure, poor blood flow, nervousness or depression.
A Such persons have a weak or damaged heart, high blood pressure, or other problems of blood system.
B Several of these conditions are present at the same time.
C Most people suffer only muscle pain as a result of heat stress.
D Several hot days are considered a heat wave.
E So does extreme heat.
F Doctors say people can do many things to protect themselves from the dangers of extreme heat.

选项

答案F

解析 第一段末尾说,白天的热浪,如果到夜晚没有降温,会给身体带来巨大压力,这是很危险的。第二段就列举了许多保护自己免受高温伤害的方法。“空48”的句子应该是位于段首的概括句。选项F说的人们有多种办法保护自己,完全符合要求,因此是答案。
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