61. What is the problem the passage begins with?

1. A high mortality rate of immune rejection.
2. A malpractice in heart transplantation.
3. An unusual case of organ transplant.
4. A shortage of human organs.

62. Not only is the gene-altering technique a technical issue, according to the passage, but also it ____.

1. introduces an issue of inhumanity
2. raises the issue of justice in medicine
3. presents a significant threat to the human nature
4. pushes the practice of organ transplant to the limits

63. Doubtful of the necessity of using animal organs, some scientists ____.

1. are to narrow the scope of organ transplants
2. switch to the development of artificial organs
3. come up with alternatives to the current problem
4. set out to purchase better ways of treating heart disease

64. It can be inferred from the concluding paragraph of the passage that ____.

1. the gene-altering technique will help those waiting for organ transplants
2. the present supply of human organs still has potential to be explored
3. people prefer the use of animal organs for medical purposes
4. the gene-altering technique leaves much to be desired

65. The information the passage carries is ____.

1. enlightening
2. unbelievable
3. imaginative
4. factual

(Reference keys.)