单项选择题

It seems that the writer ______.

A．is interested in the imaginary life forms
B．is eager to find a different form of life
C．is certain of the existence of a new life form
D．is critical of the imaginative people

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单项选择题

Humans on Earth today are characterized by ______.

A．their existence as free and separate beings
B．their capability of living under favorable conditions
C．their great power and effectiveness
D．their strong desire for living in a close-knit society

单项选择题

The passage is mainly concerned with ______.

A．the feasibility of life existing on other planets
B．the description of Mars's physical environment
C．the comparison between the physical features of Mars and the Earth
D．the feasibility of men's migrating onto Mars