单项选择题

A.6th.
B.11th.
C.7th.
D.9th.
<上一题 目录 下一题>
热门 试题

填空题
pressure。[听力原文]How to Survive the HeatGood morning, everyone! Today we are going to talk about hot weather, and the problems it can cause. We also will talk about the best ways to prevent and treat problems caused by extreme heat.As we know, floods, storms and other natural events kill thousands of people every year. So does extreme heat. In fact, heat may be nature s deadliest killer.Several hot days that follow each other are considered a heat wave. Experts say heat waves often become dangerous when the nighttime temperature does not drop much past the highest daytime temperature. This puts great pressure on the human body.Extreme heat can be harmful to very young children—especially when they are left in a car. Every year, there are news reports about young children dying after they were left inside cars in the summer sun.The most-common health problem linked to hot weather is heat stress. Usually, it is also the least severe. Most people suffer only muscle pain because of heat stress. The pain is a warning that the body is becoming too hot. Doctors say those suffering muscle pain should stop all activity and rest in a cool place. They should also drink cool liquids. Doctors say not to return to physical activity for a few hours because serious conditions can develop.Untreated heat stress can lead to a more serious problem called heat exhaustion. A person suffering from heat exhaustion loses too much water through perspiration. He or she will feel weak and extremely tired. They may have trouble walking normally. Heat exhaustion may also produce a fast heartbeat, breathing problems and pain in the head, chest or stomach. Doctors say people with such problems should rest quietly in a cool place and drink plenty of water. They also say it may help to wash with cool water.Experts say even a two percent drop in the body s water supply may cause signs of dehydration. These signs include problems with memory and even simple mathematics. The treatment for dehydration exhaustion is the same as for heat exhaustion. Drink plenty of water and rest in a cool place. Even better, doctors say, drink about two liters of water a day, so problems with dehydration will not have a chance to develop.Heat exhaustion can lead to heat stroke if it is not treated. Heat stroke is the most serious disorder linked to hot weather. It results when the body is not able to control its temperature. The body temperature increases and perspiration fails.Doctors say actions other than drinking water can protect against the health dangers of heat. Stay out of the sun, if possible. Wear loose, lightweight and light-colored clothes. Wear a hat or other head coverings when in the sun. Eat fewer hot and heavy foods. If possible, cook foods during cooler times of the day. Also, rest more often. Physical activity produces body heat.OK, after today s talk, I hope that you get these simple steps that can prevent the health problems linked to heat. They will prevent sickness, help you feel better and may even save your life.[解析] 信息题。根据录音可知夜晚的温度如果没有比白天最高温度降下来很多的话，这种热浪是很危险的，它会对人体造成很大压力。
问答题
Listening to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be done at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be done at normal speed again and during this time you should check your work. You will then be given 1 minute to check through your work once more.Sight Problems
相关试题