单项选择题
Symptoms of sea sickness include（）.
A.fever and thirst
B.nausea and dizziness
C.stomach cramps and diarrhea
D.reddening of skin and hives
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单项选择题
Symptoms of heat stroke are（）.
A.cold and moist skin，high body temperature
B.cold and dry skin，low body temperature
C.hot and moist skin，high body temperature
D.hot and dry skin，high body temperature -
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 -
单项选择题
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
