39. the Peruvian government plans to build an airport at one of the world's most cherished sites(A)

40. thousand of tourists visit Machu Picchu in the andes each year(B)

41. Environmental activist are against the decision to build the airport(C)

42. a UNESCO World heritage Site since 1983, and many believe that it should remain in touch(B)

43. many natural resources may be destroyed(B)