Text 2 This election year, the debate over cloning technology has become a circus—and hardly anybody has noticed the gorilla hiding in the tent. Even while President Bush has, endorsed throwing scientists in jail to stop "reckless experiments", it’s just possible the First Amendment will protect researchers who want to perform cloning research. Dr. Leon Kass, the chairman of the President’s Council on Bioethics, would like to keep that a secret. "I don’t want to encourage such thinking," he said. But the notion that the First Amendment creates a "right to research" has been around for a long time, and Kass knows it. In 1977, four eminent legal scholars—Thomas Emerson, Jerome Barton, Walter Berns and Harold P. Green—were asked to testify before the House Subcommittee on Science, Technology and Space. At the time, there was alarm in the country over recombinant DNA. Some people feared clones, designer babies,
A. D．recombinant DN
Text 3 In the angry debate over how much of IQ comes from the genes that children inherit from parents and how much comes from experiences, one little fact gets overlooked: no one has identified any genes (other than those in the case of retardation) that affect intelligence. So researchers led by Robert Plomin of London’s Institute of Psychiatry decided to look for some. Plomin’s colleagues drew blood from two groups of 51 children each. They are all White living in six counties around Cleveland. In one group, the average IQ is 136. In the other group, the average IQ is 103. Isolating the blood cells, the researchers then examined each child’s chromosome 6 ( One of 23 human chromosomes along which genes made of DNA). Of the 37 landmarks on chromo- some 6 that the researchers looked for, one jumped out: a form of gene called IGF2R occurred in twice as many children in high-IQ group as in the average group -- 32 percent versus 16 percent. The survey conclu
A. questioningly.
B. willingly.
C. publicly.
D. undoubtedly.
Passage Four
Increasingly, over the past ten years, people -- especially young people have become aware of the need to change their eating habits, because much of the food they eat, particularly processed food, is not good for the health. Consequently, there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers, widely used in farming today.
Natural foods, for example, are vegetables, fruit and grain which have been grown in soil that is rich in organic matter. In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount-- but not the quality -- of foods grown in commercial farming areas.
Natural foods also include animals which have be
A. foods containing large quantities of refined flour and vegetables
B. foods with fibers removed
C. foods with more fibers
D. food with additives
我来回答:
