However, scientists say the technology to put ever greater amounts of human genetic material into animals is spreading quickly around the world --- raising the possibility that some scientists in some places may want to go further than is morally acceptable.

　　Last year in Britain there was a lively debate over new laws allowing the creation of human-animal embryos (胚胎) for experiments. On one side of the debate were religious groups, who claimed that such science interferes with nature. Opposing them were scientists who pointed out that such experiments were vital to research cures for diseases.

　　The experts will publish reports after the end of the study, in which they will give definitions (定义) for animal embryos with human genes or cells, look at safety and animal welfare issues, and consider the right legal framework to work within.

　　72. What does the underlined word “they” in Paragraph 2 refer to?

　　A. Scientists in Britain and around the world.

　　B. Leaders of the research.

　　C. Guidelines for scientists.

　　D. Scientific experiments.

　　73. Scientists do research of mixing human genes into animals in order to ____.

　　A. test new drugs on animals

　　B. to find ways to fight human diseases

　　C. prove the research is morally acceptable

　　D. create monkeys and mice with livers made from human cells

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