单项选择题A.It is second-hand information and useless.B.It is gathered from other sources rather than from its inhabitants.C.It is from the arguments about the country.D.It is different from what one had before the travel.
单项选择题A.A scarcity of jobs in their field.B.Inadequate training in methods of biological research.C.Difficulties in classifying all of the varieties of owls.D.A lack of funding for their work with endangered species.