单项选择题

The number of people buying their own houses has sharply ______ as a result of the economic recession.

A．declined
B．lessened
C．descended
D．slipped
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单项选择题
Many airlines will offer substantial discounts in an effort to remain ______ during the tourist season.
A．sophisticated
B．competitive
C．considerate
D．superficial
单项选择题
The children were ______ in observing the busying ants on the ground, not hearing the calls of their mother.
A．submerged
B．immersed
C．drowned
D．dipped
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