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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热门试题

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.

单项选择题

The text seems to imply that other forms of life in the cosmos （）

A．have never existed
B．have all died out
C．may exist in the future
D．are in existence