单项选择题
It would appear that the public Sagan hopes to attract ______.
A．are interested in UFO spotting
B．are only interested in science fiction
C．are unable to write science fiction
D．have a reasonable grounding in science
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单项选择题
According to the first paragraph, the task of education is fairly complicated because ______.
A．the current public school system is too complicated to be understood
B．the public school system has no choice of what to teach
C．it is difficult to decide whether elementary science should be taught in public schools
D．the educators have to take care of both ordinary and gifted students
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单项选择题
It can be inferred from the passage that ______.
A．students should learn more up-to-date knowledge
B．lack of scientific knowledge will lead to poor relations between producers and users of scientific services
C．students are getting to know the importance of a good balance among the branches of knowledge
D．sufficient attention should be given to bask knowledge
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