Passage #3 　　One of the most hated and repulsive-looking animals, at least in Africa, is the vulture. Vultures are always the first on the scene when an animal dies. When flying at a great height, their sharp eyes can spot any dying or dead animal from an enormous distance, but despite their great size and powerful beaks, they will not touch prey that shows any sight of life, contenting themselves instead with waiting in the sky until they are sure that life is extinct. Most vultures have naked heads and necks so that there are no feathers to get coated with blood after they have been deep inside the carcass of an animal. The fact that they prey on dead animals may appear sickening to many people. However, were it not for vultures, nature would be littered with corpses, which may spread fatal virus on earth. In the last analysis, all these animal dustmen of the animal world may be evil-smelling, ugly and unlovable. But all of them make a valuable contribution to keeping the world a clean and relatively wholesome place.
43.Which of the following is NOT characteristic of vultures?
(A) They look repulsive.
(B) They prey on dead animals.
(C) They attack dying animals.
(D) They are big and their beaks are powerful.