单项选择题

Many modern language teachers make occasional use of teaching aids such as computers and tape recorders, but only a few use them systematically as an （） part of their work.

A. incredible
B. individual
C. integral
D. associate

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单项选择题
Electric wires in your house are （） with poor conductors like rubber or silk.

A. segregated
B. insulated
C. isolated
D. severed
单项选择题
The air that holds a maximum amount of water vapor is （）, like a sponge unable to hold any more water.

A. immersed
B. saturated
C. quantified
D. ventilated
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