题目内容

【题目】《齐民要术》中有这样一段描述：“凡一果，花盛时遭霜，则无子。天雨新晴，北风寒彻，是夜必霜。此时放火做煴，少得烟气，则免于霜矣。”[煴（yun）：无焰得微火]，读后回答23--24题。

【1】“天雨新晴，北风寒彻”造成“是夜必霜”，其原因是

A．雨后的夜晚气温必定很低

B．受冷空气影响，加之晴朗的夜晚，大气逆辐射较弱

C．晴朗的夜晚，地面辐射减弱

D．晴朗的夜晚，地面辐射加强

【2】“放火做煴，少得烟气，则免于霜矣”的原因是

A．“烟气”散射地面辐射，增加大气温度

B．“烟气”反射大气逆辐射，增加大气温度

C．“烟气”可阻挡冷锋前进，防治冻害

D．“烟气”吸收地面辐射，增加大气逆辐射

【答案】

【1】B

【2】D

【解析】

试题分析：

【1】“天雨新晴，北风寒彻”反映冷锋过后，气温明显下降，且天气转晴，晴天晚上，云少，大气逆辐射弱，故保温效应差，而降温明显，容易出现霜冻，故B项正确。

【2】“放火做煴，少得烟气”即人造烟幕可增强大气逆辐射，加强保温效应，则可防霜冻，故D项正确。

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