单项选择题
Sign(s) of respiratory arrest requiring artificial respiration is(are)（）.
A.vomiting
B.blue color and lack of breathing
C.irregular breathing
D.unconsciousness
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Seawater may be used for drinking（）.
A.under no conditions
B.at a maximum rate of two ounces per day
C.if gathered during or immediately after a hard rain
D.after mixing with an equal quantity of fresh water -
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Once you have established the daily ration of drinking water in a survival situation，how should you drink it?（）
A.Small sips at regular intervals during the day
B.The complete daily ration at one time during the day
C.One-third the daily ration three times daily
D.Small sips only after sunset -
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On an oceangoing vessel，for each person a lifeboat (without desalting kits) is certified to carry，the boat must be supplied with（）.
A.2 pounds of condensed milk
B.a signaling whistle
C.3 litres of water
D.a life preserver
