A. have new tecnology.
B. can change their religion.
C. have a good, stable government.
D. have more money.
答案:C
40. Today, many countries are
A. using the principles of GNH to measure their progress.
B. woking together to develop a common scale to measure GNH.
C. taking both Bhutan and Brazil as symbols for social progress.
D. trying to find their own ways to measure happiness.
答案:D
第三篇:
Genetic Engineering
Genetic engineering began when the DNA molecule(分子), the most basic unit of life, was first described in 1953 by James Watson and Francis Crick. An understanding of DNA led to the altering of normal cell reproduction. Experiments with altering human cells began in 1970. In one of the first experiments, patients were injected with a virus that would produce a life-saving enzyme, but their bodies would not accept it. In 1980 patients with a rare but fatal blood disease were injected with a purified gene that was cloned through DNA technology. Another failure.
Genetic engineering got a legal boost(激励) in 1980. The U.S. Supreme Court said that a patent could be granted on a genetically engineered oil-eating bacterium(细菌). This bacterium would help clean up oil spills. The ruling encouraged companies to invent new life forms, and three important medical products were quickly developed.
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