2．It can be inferred from the passage that a cloned animal ________. A．usually lives as long as the original one B．usually lives longer than the original one C．usually lives shorter than the original one D．is usually as healthy as the original one 3．Which of the following is NOT an advantage of cloning? A．Cloning can be used for medical purposes. B．Large quantities of food can be produced by cloning. C．Cloning can help keep animals from becoming extinct. D．Famous persons who have passed away can be cloned.