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

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