题目

Shewent to Oxford University for her further education. (同时), most of her friends got well-paidjobs. 答案：【1】Meanwhile19．硅与某非金属元素X的化合物具有高熔点高硬度的性能，X一定不可能是（　　）A．ⅣA族元素B．ⅤA族元素C．ⅥA 族元素D．ⅦA族元素