必修五Unit1 Reading课件.ppt

Warming Up There are some great scientific achievements that have changed the world. Can you name some of them? What kind of role do they play in the field of science? Do these achievements have anything in common? Match the inventions with their inventors below before you answer all these questions. Lead-in Supply the following words with detail. John Snow Cholera John Snow What is Cholera? Cholera is the illness caused by a bacterium called Vibria cholerae. It infects people’s intestines(肠), causing diarrhea(腹泻), vomiting(呕吐) and leg cramps(小腿抽筋). After a disaster, this is a very real danger, since regular, clean water and food supplies are often unavailable. The disease can be spread even further by infected people using already dirty water sources to clean themselves or dispose of waste. Cholera can be mild or even without symptoms, a severe case can lead to death without immediate treatment. The diarrhea and vomiting brought on by the infection quickly leaves the body without enough fluid. The following dehydration(脱水) and shock can kill a person within hours. When we want to solve some problem. First we should find the problem, do some research on it, prove your finding, and then make a conclusion. This is a scientific and objective way of researching. Infectious diseases can be spread to other people. They have an unknown cause and need public health care to solve them. Cholera is the illness caused by a bacterium called Varian cholera. If infects people’s intestines(肠胃), causing diarrhea(腹泻), vomiting(呕吐) and leg cramps (小腿抽筋). Cholera can be mild(不严重的) or even without symptoms(症状), but a severe case can lead to death without immediately treatment. What should you do if youre travelling to a country that has a cholera outbreak? Drink only water that you have boiled or treated with chlorine or iodine. Other safe drinks include tea or coffee made