单项选择题

There is a ______ difference in meaning between the words "surroundings" and "environment".

A．gentle
B．subtle
C．feeble
D．humble
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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
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
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