单项选择题

Carl Sagan suggests that modem man ______.

A．is very confused about the origin of the Earth
B．might possibly reach life outside the
C．believes it is possible to step off the Earth
D．is historically incapable of exploring the universe

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热门试题

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

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