单项选择题

To keep with the new developments in this field he ______ to a number of journals concerned with it.

A．subscribed
B．prescribed
C．subsidized
D．substituted
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单项选择题
Pine trees, of which them am almost one hundred ______, are found throughout the North Temperate Zone.
A．species
B．differences
C．similarities
D．standards
单项选择题
Competitors for the painting competition must ______ their entries by Friday.
A．give
B．offer
C．grant
D．submit
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