石油是重要的能源和化工原料，我国南海因为富含石油资源而被菲律宾等邻国觊觎．下列燃料不是从石油中分离出来的是（　　）

已知a＝ $\frac{1}{2016}\text{+}2015$ ，b= $\frac{1}{2016}\text{+}2016$ ，c= $\frac{1}{2016}\text{+}2017$ ，则代数式

2(a²＋b²＋c²－ab－bc－ac)的值是____．

完形填空

阅读下面短文，从下列各题所给的A、B、C三个选项中，选出可以填入空白处的最佳答案。

My mother’s loving hands

      Night after night, she came to help me sleep, even long after my childhood years.

      I don't remember1it first started making me a little angry 一 my mom's hands pushing my hair that way. But it really made me uncomfortable, for they2rough（粗糙的）against my young skin. Finally, one night, I 3 her, "Don't do that any more. Your hands are too rough!" She didn't say anything,4 she never did it again.

      Years later I missed my mother's5and her goodnight kiss on my face. I'm not a little girl any more. My mom is6 her mid-seventies, and her rough hands are still doing things for my family and me.

      Now my own children have7. It was late on Thanksgiving Eve. As I slept in my bedroom, a familiar hand ran across my8to push the hair from my head. Then a kiss, ever so softly, touched my brow（额头).

      Taking my mom's hand, I told her how9 I was for that night I shouted at her. But my mom didn't know what I was talking about. She had forgotten it long ago.

      That night, I10with a new appreciation（感激）for my mother's caring hands. And the guilt（内疚）that I had carried around for so long was nowhere to be found.

不计算，没有余数的算式是(   )