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.
词汇：
eruption n.爆发，喷发 vomit v. 呕吐
deadly adj. 致命的 muscle n. 肌肉
synthetic adj. 合成的
注释：
1.Make sure the clothing is loose.permitting freedom of movement：衣服一定要宽松，以便活动自如。make sure意为“确信，保证”，其后面从旬的谓语要用一般现在时1。如：Make sure the door is locked before you leave。permitting freedom of movement是分词短语，用作目的状语。
2.The pain is a warning that the body is becoming too
