单项选择题

The gap between those at the lowest level and those at the highest level of income had increased, and is continuing to increase.

A．substantially
B．successfully
C．succinctly
D．sufficiently
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单项选择题
Several trial efforts in the 1980s proved that it was financially ______ to restore old buildings.
A．feasible
B．probable
C．beneficiary
D．passable
单项选择题
This toothed whale has a large, square head with ______ the so-called spermaceti.
A．cavity to contain
B．cavity containing
C．the cavity for containing
D．a cavity that contains
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