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【简答题】
（5分）阅读短文，回答问题 有霜的季节，农作物常被冻坏，这就是人们常说的遭到霜冻，实际上，农作物不是因为霜而受冻的，0℃以下的低气温才是真正的凶手．当空气干燥时，即使温度降低到-20℃～-10℃，也不会出现霜，但此时农作物早就被冻坏了，农民们称这种情况为“黑霜”． （1）霜是由 直接变为小冰晶形成的，对应的物态变化是 。 （2）小红由短文猜想：“霜”形成的条件是______________和________________。 （3）小明为了验证小红的上述猜想，做了如下实验：从冰箱取出一些-10℃的冰块，放在不锈钢杯子里，一段时间后可看到在杯底出现一些白色的小冰晶（即霜）．你认为该实验 （选填“能”或“不能”）验证上述猜想．
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