单选题Seawater may be used for drinking water （）.Aat a maximum rate of two ounces per dayBafter mixing with an equal quantity of fresh waterCif gather during or immediately after a hard rainDunder no circumstance
单选题
Seawater may be used for drinking water （）.
A
at a maximum rate of two ounces per day
B
after mixing with an equal quantity of fresh water
C
if gather during or immediately after a hard rain
D
under no circumstance
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