70. Which of the following statements can best describe the sport of boxing as a whole?

　　A. It is a brutal and violent sport, with little popularity in modern times.

　　B. It is a traditional sport, with little room for improvement.

　　C. It is a controversial sport, which nevertheless enjoys great public support.

　　D. It is strictly professional sport with rigid and exclusive（不包含） rules.

　　D

　　Until recently, the "science of the future" was supposed to be electronics and artificial intelligence. Today it seems more and more likely that the next great breakthroughs in technology will be brought through a combination of those two sciences with organic chemistry and genetic engineering. This combination is the science of biotechnology.

　　Organic chemistry enables us to produce marvelous synthetic materials. However, it is still difficult to manufacture anything that has the capacity of wool to conserve (保) heat and also to absorb moisture. Nothing that we have been able to produce so far comes anywhere near the combination of strength, lightness and flexibility that we find in the bodies of ordinary insects.

　　Nevertheless, scientists in the laboratory have already succeeded in "growing" a material that has many of the characteristics of human skin. The next step may well be "biotech hearts and eyes" which can replace diseased organs in human beings. These will not be rejected by the body, as is the case with organs from humans.

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