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1. What CANNOT be inferred from the first paragraph? Scientific experiments in the past three hundred years have produced many valuable items. For three hundred years there have been people holding a hostile attitude toward science. Modern civilization depends on science so man supports scientific progress unanimously. Some people think three hundred years is not long enough to set back for critical appraisal of scientific method. 2. The principle discovery in this century shows man has overthrown Newtons laws of physics man has solved a new set of gigantic puzzles man has lost many scientific discoveries man has given up some of the once accepted theories 3. Now scientists have found in the past few years__________ the exposure of DNA to the public is unnecessary the tiny cell in DNA is a neat little machine man knows nothing about DNA man has much to learn about DNA 4. The writers main purpose in writing the passage is to say that science is just at its beginning science has greatly improved mans life science has made profound progress science has done too little to human beings | 
