单项选择题

What does the passage mainly discuss

A． Similarities between computer stored information and electronic books.
B． Content kept in electronic books.
C． Different types of electronic books.
D． Development of electronic books in future.

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单项选择题

Paragraph 4 discusses: ______.

A． the crime rate in 1997
B． the disadvantages of life in 1997
C． the advantages of life today
D． the advantages of life in 1997

单项选择题

Dick compares the notion of extraterrestrial life to Copernicus' declaration in order to ______.

A． account for intense emotions involved
B． show the related history background
C． point out the confusion brought about
D． prove the correctness of the notion