单项选择题

These pollutants can be ______ hundreds and even thousands of kilometers by large air masses.

A．contained
B．conveyed
C．contaminated
D．conserved
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单项选择题
In a divorce, the mother usually is granted ______ of her children.
A．support
B．retention
C．perseverance
D．custody
单项选择题
A ______ of soap and two brightly colored towels were left beside the bath, then the woman smiled politely at Nicole and withdrew carefully from the room.
A．loaf
B．bar
C．stick
D．block
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