【单选题】The main interest of travel companies dealing with travel medicine is to
A．prevent people from falling ill.
B．make money out of it.
C．give advice on specific counties.
D．get the government to pay for it.
【单选题】The main interest of travel companies dealing with travel medicine is to
A．prevent people from falling ill.
B．make money out of it.
C．give advice on specific counties.
D．get the government to pay for it.
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