题目

You can't always predict a heavy rain or remember your umbrella. But designer Mikhail Belyacv doesn't think that forgetting to check the weather forecast before heading out should result in your getting wet. That's why he created lampbrella, a lamp post with its own rain sensing umbrella. The designer says he came up with the idea after watching people get wet on streets in Russia. Once, I was driving on a central Saint Petersburg street and saw the street lamps lighting up people trying to hide from the rain. I thought it would be appropriate to have a canopy(遮蓬)built into a street 金刚石、石墨和C60都是由碳元素组成的单质，下列说法中正确的是A．它们是同一种物质B．它们碳原子的排列方式不同C．它们的化学性质不同D．它们的物理性质相同