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

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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
单项选择题
（34）（）

A. arms
B. feet
C. heart
D. organs
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