單項選擇題

病人,男性,60歲。烈日下從事田間勞動約1小時后感覺口渴、頭暈、胸悶、惡心、四肢無力,緊急送往醫(yī)院治療。查體溫8°C,脈搏100次/分,未發(fā)現(xiàn)其他異常,休息約半小時后癥狀消失。該病人出現(xiàn)上述癥狀,應(yīng)首先考慮的原因是（）

A.過度勞累
B.睡眠不足
C.高溫環(huán)境
D.身體虛弱
E.飲食過飽
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