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单项选择题

Why are publishers making their books freely available

A．They want to make money.
B．They don' t like to lose their audience.
C．They are competing for fun.
D．They try to win more freedom.
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单项选择题What method does the author mainly use in the passage to achieve better effects

A．Examples.
B．Listing.
C．Comparisons and listing.
D．Analysis and examples.

单项选择题The electronic version of newspapers has all the following advantages except that______

A．it can be carried around
B．it can be read in many places
C．it can be immediately accessed
D．it requires little delivery cost

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 enoug

单项选择题The author wants to tell us in Par

A．1-4______.A. DNA' s functionsB. DNA' s applicationsC. DNA' s researchD. DNA' s techniques