单项选择题

How much does Sagan ,think America should spend on Space Exploration

A．More than she does at present.
B．Less than she does at present.
C．As much as England did in the sixteenth century.
D．All of her gross national income.

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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

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