76~80 B E F A D
(普陀)
A. The great impact and progress in genetic engineering
B. Worries about privacy protection
C. Worries about medical use of genetic engineering
D. Genetic knowledge helps to predict diseases
E. Possibilities of misuse genetic knowledge
F. The application of genetic engineering in the medical fields
76. ______________________
Current research into the human gene system is helping us understand why people have predispositions(易患某病倾向) to certain diseases. Knowing our genetic makeup can help us to judge whether or not we may be stricken by particular illness, such as cancer. Even before birth, we are able to do genetic screenings to determine what a child's genetic disorder will be. Scientists have already isolated and identified the genes responsible for the more than 4,000 genetic diseases that affect human beings.
77. ______________________
The implications of this knowledge are astonishing. In addition to predicting genetic predisposition towards diseases, gene therapies may provide new treatments or cures for serious diseases. Millions of people already use genetically engineered drugs to treat heart disease, cancer, AIDS, and strokes(中风). But with the research that is now being conducted, we may find cures to many more diseases. In the near future, genetic experimentation will also allow parents to select the traits of their children. Genetic traits that determine height, weight, eye and hair color will be able to be controlled, and many parents are excited about this potential.
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