If the temperature is below 0oC, water will turn into __________ in the open air.

A. ice B. steam C. fog D. rain

A 【解析】 句意：如果溫度低于0攝氏度，水會(huì)在戶(hù)外變成冰。A. ice冰；B. steam蒸汽；C. fog霧；D. rain雨。根據(jù)物理知識(shí)，在一個(gè)大氣壓下,水的熔點(diǎn)是0℃，低于0攝氏度，水會(huì)變成冰，故答案為A。
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