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. 1 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. 2 Experts 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.
3 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 movement1. And learn the danger signs of the medical problems, such as headache and vomiting that are linked to heat. Most people suffer only muscle pain as a result of heat stress. 4 pain is a warning that the body is becoming too hot2. Doctors say those suffering headache or muscle pain should stop all activity3 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. 5 Hot weather also increases dangers for people who must take medicine for high blood pressure4, poor blood flow, nervousness or depression.
练习：
A Such persons have a weak or damaged heart, high blood pressure, or other problems of the 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.
答案与题解：
1.E本文的标题是Heat Is Killer，通篇文章说的是heat的危害性及预防方法。“空l”前面的句子说，“Floods，storms，volcano eruptions and other natural events kill thousands of people every year”，“空l”后面的句子说，“…heat may be nature’s deadliest killer”。将两个句子所表达的意思汇总来看，floods，storms，volcano eruptions和高温都是杀手，而以高温更烈。“空l”的句子一定与“杀手”有关。五个选项中只有+E符合这个条件，所以E是答案。
2.D“空2”后面的句子说到heat waves，而选项D的句子中也出现heat wave，说明这两个句子意思上有联系。“空2”的句子是对“heat wave”下定义，为下一句的展开作了铺垫。D是答案。
3.F第一段末尾说，热浪期间，当黑夜与白天温差不大，对人体伤害很大。第二段就列举了许多保护自己免受高温伤害的方法。“空3”的句子应该是位于段首的概括句。选项F说人们有多种办法保护自己，完全符合要求，因此是答案。
4.C紧跟“空4”后面句子中有特指的the pain，说明前文一定出现过pain这个词。选项C的句子中有pain，且C的句子填人后，上下文意思连贯，所以是答案。
5.A“空5”前面的句子说：某些人在热浪期间特别危险。读者或许会问，是哪些人呢?选项A回答了这个问题，所以是答案。