改革是社会发展的动力。阅读下列材料，请回答问题。

材料一： 春秋战国时期，各诸侯国战乱频繁，相互杀伐，为了避免被吞并的命运，为了称雄诸侯，各国先后开展了一系列社会变革，其中最彻底的，就要数商鞅变法了。

材料二： 他被任命为左庶长，以颁布《垦草令》为起端，先后两次推行变法。内容主要包括：废井田，开阡陌实行土地私有制；推行小家庭制度，重农抑商，奖励耕织；废除世卿世禄制，奖励军功……统一度量衡；等等。

材料三： 随着秦孝公的去世，新继位的惠文王为了稳固自己的统治，把商鞅抛出来以缓解社会各界的积怨……商鞅虽然被处死，但其变法措施仍得以延续。

                                                                                                                                                      以上材料均摘自《商鞅变法：不为人关注的另一面》

阅读下列材料，从每题所给的A、B、C、D四个选项中选出最佳选项。

    Many people use the mobile phones as the alarm clocks and also use them to check e-mails before sleeping. It's a pity that these habits are becoming their sleeping problems.

    Several years ago, my boss always played her mobile phone till very late and got badly ill because of that. Now she always leaves her phone in another room at night. And she asks her friends to do so. "I give each of my friends the same Christmas gift — an alarm clock. So they could stop using the phone as the alarm clock," she said.

    If your mobile phone wakes you up in the morning, it may also keep you up at night. A study shows that people in mobile phone radiation mostly have sleeping problems. And according to a Swedish study, a quarter of young people in this country like having their phones around them. Most of them feel sorry for not answering messages. So they even have to answer messages to their friends before sleeping. 

    So what kind of people like to use mobile phones in their bedrooms better? A study has shown that three-quarters of people aged between 18 and 34 like to sleep with their phones near them better. That number becomes smaller in the middle age, but only people aged 65 and older like leaving the phone in another room when they are sleeping.