单项选择题

The substance ______ easily through groundwater, and some communities have experienced acute episodes of water pollution after underground storage tanks ruptured.

A．perfuses
B．perscusses
C．percolates
D．perforates
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单项选择题
Unlike their seniors who remember a world without TV, they are as ______ in sounds and imager as in the printed word, and as often as not, prefer to do business that way.
A．literary
B．literate
C．literal
D．literacy
单项选择题
Alternatively, researchers seeking access to identifiable, records or specimens can use expedited IRB review, in which one board member is ______ to rapidly approve such studies.
A．controlled
B．enrolled
C．enlisted
D．authorized
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