67. The author wants to prove with the example of Isaac Newton that __

　　[A] inquiring minds are more important than scientific experiments

　　[B] science advances when fruitful researches are conducted

　　[C] scientists seldom forget the essential nature of research

　　[D] unpredictability weighs less than prediction in scientific research

　　68. The author asserts that scientists __

　　[A] shouldn’t replace "scientific method" with imaginative thought

　　[B] shouldn’t neglect to speculate on unpredictable things

　　[C] should write more concise reports for technical journals

　　[D]should be confident about their research findings

　　69. It seems that some young scientists__

　　[A] have a keen interest in prediction

　　[B] often speculate on the future

　　[C] think highly of creative thinking

　　[D] stick to "scientific method"

　　70. The author implies that the results of scientific research__

　　[A] may not be as profitable as they are expected

　　[B] can be measured in dollars and cents

　　[C] rely on conformity to a standard pattern

　　[D] are mostly underestimated by management