单项选择题

Since the island soil has been barren for so many years, the natives must now______much of their food.

A．deliver
B．import
C．produce
D．develop
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How large a proportion of the sales of stores in or near resort areas can be______ to tourist spending
A．attributed
B．applied
C．contributed
D．attached
单项选择题
The fact that the earth's surface heats ______ provides a convenient way to divide it into temperature region.
A．infrequently
B．irregularly
C．unsteadily
D．unevenly
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