题目

阅读下面短文，根据其内容写一篇60词左右的内容概要。 Look inside any family home in the evening, and you might see a typical enough scene: Mom and Dad, each on their own laptop or tablet, streaming movies, catching up on work or maybe answering emails on their smartphones. Meanwhile, one child is chatting online with one school friend while texting another. The other is playing a video game with a friend on the other side of the city at the same time. Each member of the family is totally absorbed in his or her own piece of technology. According to some experts, the effect17．若（1-2x）5=a0+a1x+…+a5x5（x∈R），则（a0+a2+a4）2-（a1+a3+a5）2=（　　）A．243B．-243C．81D．-81