单项选择题

Which of the following situations is among the troubles print has

A．It is dear to find printed materials.
B．Frequent editing is needed for better layout.
C．Paper is passed around quickly.
D．The space to restore articles is not enough.

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单项选择题

What does the author probably foresee

A．Readers will have more accesses.
B．Books and newspapers will be kept as computer files.
C．It will not make any sense to keep the printed versions.
D．Electronic publications will replace printed ones.

单项选择题

What is the main idea of Para 5-7(last three paragraphs)

A．DNA's future tendencies.
B．DNA's controversy.
C．DNA's potentials.
D．DNA's social issues.