Travel medicine has also been colonized by commercial interests -- the vast majority of travel clinics in Britain are run by airlines or travel companies, And while travel concerns are happy to sell profitable injections, they may be less keen to spread bad news about travelers' diarrhea in Turkey, or to take the time to spell out preventive measures travelers could take. "The NHS finds it difficult :to define travelers' health," says Ron Behrens, the only NHS consultant in travel and tropical medicine and director of the travel clinic of the Hospital for Tropical Diseases in London. "Should it come within the NHS or should it be paid for? It's a gray area, and opinion is split. No one seems to have any responsibility for defining its role," he says.

To compound its low status in the medical hierarchy, travel medicine has to rely on statistics that are patchy at best. In most cases we just don't know how many Britons contract diseases when abroad. And even if a disease is linked to travel there is rarely any information about where those afflicted went, what they ate, how they behaved, or which vaccinations they had. This shortage of hard facts and figures makes it difficult to give detailed advice to people, information that might even save their lives.

A recent leader in the British Medical Journal argued: "Travel medicine will emerge as a credible discipline only if the risks encountered by travelers and the relative benefits of public health interventions are well defined in terms of their relative occurrence, distribution and control." Exactly how much money is wasted by poor travel advice? The real figure is anybody's guess, but it could easily run into millions. Behrens gives one example. Britain spends more than ~ 1 million each year just on cholera vaccines that often don't work and so give people a false sense of security: "Information on the prevention and treatment of all forms of diarrhea would be a better priority," he says.

55. According to the passage, travel medicine in Britain is_______
A. not something that anyone wants to manage. B. the responsibility of the government.
C. administered by private doctors. D. handled adequately by travel agents.

56. The main purpose of travel companies' dealing with travel medicine is to_______
A. prevent people from falling iii. B. make money out of it.
C. give advice on specific countries. D. get the government to pay for itl

57. In Behren's opinion the question of who should run travel medicine________
A. is for the government to decide. B. should be left to specialist hospitals.
C. can be left to travel compames. D. has no clear and simple answer.

58. People may think better of travel medicine if_______
A. it is given more resources by the government.
B. more accurate information on its value is available.
C. the government takes over responsibility from the NHS.
D. travelers pay more attention to the advice they get.

Questions 59 to 62 are based on the following passage:

In a recent survey, 25 percent of Americans said they believed that NASA (US National Aeronautics and Space Administration) had faked landingon the moon and humans had yet to walk upon its surface. Why do so many people believe such a foolish idea and is there any real evidence to support it?