Fireworks are a big part of Fourth of July celebrations in the United States, as hundreds of thousands of Americans enjoyed public pyrotechnic displays across the country Sunday night to celebrate the U.S. birthday. The holiday throws the spotlight on another annual campaign ,an effort to completely ban consumer fireworks in the United States.As Americans around the country watched July Fourth fireworks celebrations, debate has been simmering about whether individuals should be allowed to buy fireworks to celebrate privately. Seven U.S. states prohibit sales of all consumer fireworks. A coalition of groups, led by James Shannon, president of the non-profit fire safety group, the National Fire Protection Association, says that ban should be extended to include the entire United States. "Those fireworks axe inherently dangerous products," he said. "There might be another problem with some of them being designed defectively, so that they are particularly dangerous. But even when they’re designed to do what they’re supposed to do and do it, they can be very, very dangerous products. "Other members of the coalition include the International Fire Chiefs Association and the American Academy of Pediatrics, which has focused on the dangers fireworks pose to children.The U.S. Consumer Product Safety Commission, an independent federal regulatory agency, says fireworks-related accidents in the United States in 2002 killed four people and injured about 8, 800 others in the United States. About haft of the people injured were children, a fact pointed to by Mr. Shannon. "I don’t think serious injury is as American as apple pie, if it’s avoidable. And particularly, if we’re talking about children, thousands and thousands of children, "he said.But fireworks have strong defenders, such as the American Pyrotechnic Association, which says that they are becoming more and more popular in the United States. Officials with the association say that fireworks use in the United States has more than tripled since 1990, to nearly 100-kilograms in 2003. And Ann Crampton, spokeswoman for the National Council on Fireworks Safety, says fireworks are a big part of Fouth of July celebration and their use should not be banned. But Ms. Crampton also says people should exercise care when using them. "We know that millions of people are going to be celebrating with fireworks on the Fourth of July, "she said. "It’s become part of a symbol of this country. Many thousands of people, millions of people, enjoy going to public displays. But there are also people that like to be hands-on and do it themselves in their backyards. We feel they can be safe and they can be injury-free if they choose the right product, know what to choose,what to stay away from."Most of the fireworks sold in the United States come from China. According to the U.S. Census Bureau, Chinese fireworks imports to the United States in 2003 amounted to more than $157-million. Ms. Crampton says the U.S. pyrotechnics industry has been working with Chinese manufacturers to make fireworks safer. "And about 15 years ago, a group was formed, called the American Fireworks Standards Laboratory, to work with Chinese manufacturers, to make sure that the product that they were making meets the safety standards that are required here," she said.The National Fire Protection Association has been lobbying against consumer fireworks sales since 1910. Their efforts are not going to be made any easier by Consumer Product Safety Commission statistics showing that the number of fireworks-related deaths and injuries in the United States has actually fallen in recent years. In defending the firework sale in US, the American Pyrotechnic Association argued().
A. fireworks are a big part of Fouth of July celebration and their use should not be banned
B. people should exercise care when using them
C. fireworks are becoming more and more popular in the United States
D. Americans can be injury-free if they choose the right product
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张先生,30岁,电工,Ⅲ度烧伤,烧伤总面积 70%,对该病人应采用
A. 严密隔离
B. 肠道隔离
C. 接触隔离
D. 保护性隔离
E. 呼吸道隔离
下列不属严格隔离原则的是
A. 采用黄色标志
B. 入室者要戴口罩、帽子、穿隔离衣及戴手套
C. 污染敷料在隔离室外立即装袋标记送生活垃圾箱
D. 接触病人或污染敷料后及护理另一病人前必须认真洗手
E. 设专用隔离室,门窗关闭。感染同一病原体的病人可同居一室
A Canadian researcher has discovered that sound travels (21) air more than one-half kilometer an hour slower than had been believed. The discovery has surprised many engineers and scientists who learned they had been (22) the wrong speed of sound for many years.The speed of sound in air had been (23) to be three-hundred-thirty-one-point-two-nine meters a second. But Doctor George Wong found, (24) accident, that the speed of sound is only three-hundred-thirty-one-point-one-three meters a second. That is a difference of about sixteen centimeters a second.Doctor Wong is a member of the National Research Council of Canada. He was studying ways to (25) exactly the sound created by microphones. One of his experiments (26) a number he could use to find the speed of sound. He was (27) to learn that the speed of sound was slower than scientists had thought.To explain the difference, Doctor Wong spent eighteen months (28) past test research on the speed of sound. He finally found the (29) of the difference. It was a mathematics mistake (30) in Nineteen-Forty-Two by physicist H-C Hardy.Doctor Wong’s (31) does not mean a big change for the science of sound. This is (32) Doctor Hardy and Doctor Wong measured the speed of sound for what is called" standard air".Standard air exists only (33) thought. It is a way for scientists to agree (34) the same speed of sound. (35) the air around us, standard air always has a temperature of zero degrees Celsius and the same atmospheric pressure (36) the air at sea level. Standard air always has same amounts of nitrogen, oxygen, carbon dioxide and (37) gases. And in standard air, the speed of sound does not change.The change in the new speed of sound is (38) small to affect the work of most sound scientists and engineers. But scientists say Doctor Wong’s discovery may (39) improve instruments (40) use the speed of sound to measure very short distances. 37().
A. learnt
B. learn
C. studied
D. studying
China and Thailand are fighting fresh outbreaks of the highly contagious bird flu, which killed 24 people in Southeast Asia earlier this year. Authorities in both China and Thailand assured frightened residents the new outbreaks of the deadly H5N1 strain of the avian flu were under control and the threat of a mass epidemic is unlikely. There have been no cases of transmission to humans in either country so far.In China, officials say the virus was discovered on a farm approximately 300 kilometers west of Shanghai. Residents of the infected farm have been quarantined and all poultry within two kilometers have been killed.Officials say they will strengthen a quarantine of local poultry markets to further reduce the risk to people in the area. Julie Hall of the World Health Organization says Chinese authorities are acting to contain the virus. "They’ve been able to detect these birds are getting sick and they’ve put in place the correct measures and enhance surveillance," she says.China announced it wiped out the lethal strain of the bird flu four months ago and blamed this most recent outbreak on migratory birds.In Thailand lab tests confirmed outbreaks on two farms in towns near Bangkok. Thousands of chickens on those farms have been destroyed and officials insist there is no evidence the disease has spread. This is the first confirmed outbreak in Thailand since April. Thailand is the world’s fourth largest exporter of chickens and bans on its poultry exports have damaged the national economy.Previous outbreaks of the deadly flu in Asia this year led to the destruction of 100 million fowl and fueled concerns of massive human fatalities. Sixteen people died in Vietnam and another eight in Thailand.The deadly H5N1 strain of the avian flu was first discovered in humans in Hong Kong in 1997. The flu is transmitted from live poultry to humans but doctors say it cannot be spread in cooked food and the risk of infection remains slight. Which one of the following four statements is not one of the measures taken by Chinese government to contain the new bird flu outbreak()
A. To quarantine the infected areas.
B. To kill all poultry within two kilometers of the infected farm.
C. To ban the poultry sale across the country.
D. To quarantine the residents living close to the infected farm.