单项选择题
From the passage we understand that Carl Sagan writes ______.
A．forcefully and complexly
B．elaborately and literally
C．simply and humorously
D．snobbishly and cleverly
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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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