(01.02 MC)Reаd the pаssаge frоm On the Trail: An Outdооr Book for Girls by Adelia and Lina Beard. Answer the question that follows.The Adirondack and North Woods region is not only the resort of hunters, campers, and seekers after health and pleasure, but it is also the haunt of the maddening black-fly. From early spring until the middle of July or first of August the black-fly holds the territory; then it evacuates and is seen no more until next season, when it begins a new campaign.Under the name of buffalo-fly the black-fly is found in the west, where, on the prairies, it has been known to wage war on horses until death ensued—death of the horses, not of the fly. It is a small fly about one-sixth of an inch long, thick-bodied, and black. It is said to have broad silvery circles on its legs, but no one ever stops to look at these. Its proboscis is developed to draw blood freely, and it is always in working order.The only virtue the black-fly seems to have is its habit of quitting operations at sundown and leaving to other tormenters the task of keeping you awake at night. When the black-fly bites you will know it, and it will leave its mark, when it does leave, which must generally be by your help, for it holds on with commendable persistence. If you would learn more of this charming insect, look forSimulium molestumin a book which treats the subject scientifically.What is the central idea of this passage?