71. What does the author think of the change in today’s children?

　　       A. He feels their adultlike behavior is so funny.

　　       B. He thinks the change worthy of note.

　　C. He considers it a rapid development

　　D. He seems to be upset about it.

　　E

　　Is a mouse that can speak acceptable? How about a dog with human hands or feet? Scientists, the people with the know-how to make such things happen, are now thinking about whether such experiments are morally right or not.

　　On Nov. 10, Britain’s Academy of Medical Sciences launched a study on the use of animals with human materials in scientific research. The work is expected to take at least a year, but its leaders hope it will lead to guidelines for scientists in Britain and around the world on how far they can go mixing human genes into animals in search of ways to fight human diseases.

　　“Do these constructs (构想) challenge our idea of what it is to be human?” asked Martin Bobrow, a professor of medical genetics at Cambridge University and chair of a 14-member group looking into the issue. “It is important that we consider these questions now so that appropriate boundaries are recognized.”

　　Using human material in animals is not new. Scientists have already created monkeys that have a human form of the Huntingdon’s gene so they can study how the disease develops; and mice with livers (肝) made from human cells are being used to study the effects of new drugs.

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