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47. Regarding people's concerns about germ cells experiments which of the following statements is NOT true? (A) Human beings probably are not able to afford the consequences of the human genetic experiments. (B) Governments are afraid that, if they allow the experiments, scientists may force humans to move toward and evolve on an unnatural path. (C) Our chromosomes are very valuable, people should not try to profit on them. (D) Trying to manipulate human genes and hence affect the course of natural evolution is dangerous.

48. Which of the following statements does NOT reflect James Watson's attitude? (A) In the next century, scientists probably will fail to insert genetic materials into human germ cells. (B) Experiments on human germ cells should not be delayed. (C) Scientists are not responsible and may create monsters! (D) The dangers that people fear regarding evolution might never happen.

49. What do you think the phrase "off limits" means? (A) Forbidden. (B) Doubtful. (C) Interesting (D) Unlimited

50. What does the phrase "to modify ...our chromosomal instruction books" mean? (A) to learn genetic science (B) to change our DNA (C) to realize the course of evolution (D) to help teach chromosomes

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