14.The word “random” in line 12 is closest in meaning to (A) unfortunate (B) unusual (C) unobservable (D) unpredictable

17. Some birds that are molting maintain balance during flight by (A) constantly preening and caring for their remaining feathers (B) dropping flight feathers on both sides at the same time (C) adjusting the angle of their flight to compensate for lost feathers (D) only losing one-third of their feathers