Each year there are at least five million people around the world who develop serious（流感） and almost half a million deaths ，When someone we know gets the flu virus （病毒），we expect them to be very careful not to pass it on to other． Doctors and nurses working with flu patients also need to protect themselves from the virus ，But what is the best way to do this？ This is the question that Professor Jonathan Van﹣Tam is trying to answer． He wants to find out how flu is transmitted（传播），so that he can stop doctors and nurses getting sick．

Since 2008 Van Tam has been in charge of an Intentional group studying how the flu virus travels． For the first time， 41 volunteer agreed to live together． They lived in a clinic（诊所）in Cambridgeshire for two weeks， where they came into contact with the flu virus．

Van﹣Tam explains their methods． "Everyone lives together in the small space for four days．Some wear face masks， and wash hands every 15 minutes， but some have no protection．

In his way we can study who catches he flu and which ways of transmitting flu are important．"

The experiment（试验） is not simple． At the moment the team are working on three studies．

Van﹣Tam believes that if this type of study works well the results will help decide what protection people need working in hospital with flu patients around the world． And perhaps it could declinethe number of deaths from flu each year．

（1）From the first paragraph， we know that 　　．

A．	at least five million people develop serious flu every year all over the world
B．	about a million people die of flu in one year in the world
C．	it is impossible for the people who catch the flu to pass the virus on to others
D．	doctors and nurses have found the best way to protect themselves from the virus

（2）Why does professor Van﹣Tam use the methods？ 　　

A．	Because he has been in charge of an international group．
B．	Because he wants them to come into contact with the flu virus
C．	Because he wants to find out how flu is transmitted
D．	Because he can protect them．

（3）According to the methods Van﹣Tam explain， what do some of the volunteers do in the small space？ 　　

A．	Have no sleep．
B．	Wear glasses
C．	Have no break．
D．	Wear face masks．

（4）The underlined word "'decline" in the last paragraph probably means " 　　"．

A．	增加
B．	降落
C．	控制
D．	减少

（5）According to the passage we can infer（推断）that 　　．

A．	professor Van﹣Tam wants his study to help reduce the possibility of catching flu
B．	all the volunteers didn't have contact with the flu virus
C．	the group led by Van Tam only did one study
D．	the studies have already been finished