题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Food waste inAmericaJust how much food do Americans waste? Here are somenumbers: The United States is the global leader in food waste, with Americansthrowing away nearly 40 million tons of food every year. That is equal to morethan $161 billion. But the truth is that 37 million people across America —including 11 million children, are suffering from food shortage. More than 80 percent of Americans give up perfectlygood food simply because they misunderstand expiration (X和Y属短周期元素，Y原子的最外层电子数是次外层电子数的3倍，X位于Y的后一周期，且最外层电子数是次外层电子数的一半，则X和Y形成的化合物的化学式可表示为（　　）A、XYB、XY2C、XY3D、X2Y3