单项选择题

In the third paragraph it is mentioned that by means of science ______.are analysed and studied.

A．the ways in which cells formed
B．changes in organic life
C．the main ways in which organisms develop
D．processes on which organic life depends
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单项选择题
Which of the following can best sum up the passage
A．Media Selection in Managing Information Resources.
B．The Importance and Necessity of Media Conversion.
C．Three Categories of Information Media.
D．Various Means of Communicating Information.
单项选择题
The first paragraph aims to tell the reader ______.
A．the importance of information-resource management
B．the relationship between the medium and information
C．the great variety of media for holding information
D．the numerous resources of information
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