托福考试写作例文6
发布时间：2013/7/17 21:43:33 来源：城市网学院 编辑：admin
Read the passage and then listen to the recording. Read the integrated writing question and the five responses that follow. Evaluate each response according to the descriptions of the five levels. Assign each response a score of 5,4,3,2 or 1.
Reading Time – 3 minutes
The discovery of penicillin and other antibiotic drugs is the most dramatic medical development of the twentieth century. These new drugs quickly became known as “wonder drugs” because they saved so many lives that were threatened by major forms of infection. The research that led to their development rested on the belief that chemicals could be found that would destroy specific microorganisms without injuring the human body at the same time. Advances in chemistry and in the knowledge of bacteria quickened the discovery of such chemicals.
In 1933, the first of the sulfa drugs, prontosil, was tested clinically on humans and was found to cure blood infections that would otherwise have been fatal. In 1941, the first successful human tests of penicillin were conducted on cases of streptococcus infections. The discovery of penicillin laid the foundation for even more powerful weapons against specific diseases. Within the next decade, researchers identified some 200 antibiotic substances that were effective against one or another type of bacteria. One of the most important was streptomycin, found to be potent against tuberculosis and other infections that were not affected by penicillin.
Antibiotics gave the medical profession powerful tools that could directly fight a very wide range of specific diseases. They made possible the survival of patients during and after surgery. No longer was it necessary to depend largely on the body’s own immune system to fight off major infections; these infections could be attacked directly with drugs. Among the most spectacular effects of antibiotics were reductions in the number of deaths from pneumonia and tuberculosis.
