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

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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

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