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Slater Swine influenza (also called swine flu, hog flu, and pig flu) refers to influenza caused by those strains of influenza virus, called swine influenza virus (SIV), that usually infect pigs. Swine influenza is common in pigs in the Midwestern United States (and occasionally in other states), Mexico, Canada, South America, Europe (including the United Kingdom, Sweden, and Italy), Kenya, Mainland China, Taiwan, Japan and other parts of eastern Asia. Mike Smith Transmission of swine influenza virus from pigs to humans is not common and properly cooked pork poses no risk of infection. When transmission results in influenza in a human, it is called zoonotic swine flu. People who work with pigs, especially people with intense exposures, are at risk of catching swine flu. Rarely, these strains of swine flu can pass from human to human. In humans, the symptoms of swine flu are similar to those of influenza and of influenza-like illness

[单项选择]According to the man, because of the swine-flu

[单项选择]Most viruses that cause swine flu or bird flu are very hard to pass from one human to another: they don’t cause epidemics. Sometimes, however, further changes in genes create a virus that can spread rapidly among humans, and can produce a more severe illness. One reason this illness is more severe is that the virus is so new. The regular flu that comes each year is caused by a regular human influenza virus that often has similarities to the viruses that have caused the nu in years past, so people have some degree of immunity to the latest virus. The unusual swine flu or bird flu viruses that develop the ability for person-to-person spread are so different that people have little or no immunity to them.
What is the main reason that the swine flu is very dangerous to humans
A. That it is fatal and has killed many. B That it has spread to many countries.
C. That people know nothing about it. D. That people have no immunity to it.

[多项选择]What are the symptoms of swine flu
A. Chills, fever, and sore throat
B. Muscle pains and headache.
C. Shedding tears, sneezing and toothache.
D. Coughing, weakness and discomfort.

[单项选择]What can be done to prevent swine flu
A. Stop touching mouth, nose or eyes.
B. Avoid using tabletops and telephones.
C. Prevent people from taking buses.
D. Wash hands and keep social distanc

[单项选择]　8 New York Students Have Swine Flu 　　The Centers for Disease Control and Prevention has confirmed 51 of swine flu in eight students at a New York preparatory school, Mayor Michael Bloomberg said Sunday. The students have had only 52 symptoms and none have been hospitalized, he said. Some of the students have already recovered. 　　More than 100 students were absent from 53 due to flu-like symptoms last week. New York health officials tested samples for eight students Saturday and determined the students were probably 54 from swine flu, and the CDC confirmed the 55 on Sunday, Bloomberg said. 　　The announcement brings the 56 of confirmed swine flu cases in the United States to 20. Bloomberg and New York Health Commissioner Tom Frieden said there is no 57 of a citywide outbreak of the flu, and no sign of a potential 58 of swine flu at other schools. 　　Some students at the school 59 spring break1 in Mexico, Bloomberg said, but authorities have not determined 60 any of the students with
A. treatment
B. diagnosis
C. doubt
D. choice