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
单项选择题 Symptoms of heat stroke are（）.
单项选择题 Sign(s) of respiratory arrest requiring artificial respiration is(are)（）.
单项选择题 Seawater may be used for drinking（）.
