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阅读理解It's not common that agrandmother aged 89 is crowned Queen of Icebergs in north America, but when itdoes happen it's quite the sight.On a recent trip toIceland, Judith Streng became that grandma after her son attempted to take aphotograph of her sitting on an ice structure that looks like a throne (宝座) atDiamond Beach in Jokul. Shortly after Streng sat down to pose, the piece of icebroke off and floated into the water.I thought it wassafe. One girl had been on it and then two girls at the same time, and it wasvery secure with them. When I got on it, it started to shake and a wa下列关于热现象的说法中，正确的是（ ）A．火箭用氢作燃料主要是因为氢的热值高B．汽油机压缩冲程把内能转化为机械能C．沿海地区昼夜温差比内陆地区小，是因为水的比热容小D．冬天搓手取暖是利用热传递来改变内能