47. What did the Common Sense Media survey reveal?
- A. Most parents tended to overprotect their children.
- B. Many students committed cheating unknowingly.
- C. Students were in urgent need of ethical education.
- D. Parents and kids had conflicting ideas over cheating.
答案：D
答案句：A Common Sense Media survey found that 35 percent of students had cheated via smartphone, though the parents surveyed in that particular study did not believe their kids had ever cheated.
参考译文：常识媒体的一项调查发现，35%的学生曾通过智能手机作弊，尽管该研究中的受访家长不相信他们的孩子曾经作弊。
定位线索：题干“Common Sense Media survey”→答案句取自第1段“A Common Sense Media survey”；文中“parents did not believe their kids had ever cheated”对应选项“Parents and kids had conflicting ideas”；文中“35 percent of students had cheated”与家长看法形成对比。
解析：题干问常识媒体调查揭示了什么，答案句指出35%学生承认作弊但家长不相信孩子作弊，形成明显对比，对应D选项“家长和孩子对作弊看法冲突”。A选项“过度保护”无中生有；B选项“不知情作弊”与原文“had cheated”不符；C选项“急需伦理教育”是过度推断。
49. What does the author think schools should do to tackle cheating?
- A. Bring policies against cheating up to date.
- B. Reform their exam methods constantly.
- C. Take advantage of the latest technologies.
- D. Alert parents to their children's behaviour.
答案：A
答案句：Schools must develop anti-cheating policies that include technology and these policies must be updated consistently.
参考译文：学校必须制定包含技术的反作弊政策，并且这些政策必须不断更新。
定位线索：题干“schools should do to tackle cheating”→答案句取自第3段“Schools must develop anti-cheating policies”；文中“policies must be updated consistently”对应选项“Bring policies against cheating up to date”；文中“include technology”体现政策需跟上技术发展。
解析：题干问作者认为学校应如何应对作弊，答案句直接提出学校必须制定并不断更新反作弊政策，对应A选项“更新反作弊政策”。B选项“改革考试方式”无中生有；C选项“利用最新技术”偷换概念，原文是政策包含技术而非利用技术；D选项“提醒家长”是给家长的建议，非学校。
50. What does the author suggest teachers do in the classroom?
- A. Prevent students from overusing electronic devices.
- B. Develop more effective anti-cheating strategies.
- C. Find more ways to curb students' unethical acts.
- D. Guard against students' misuse of technology.
答案：D
答案句：Teachers must stay on guard when it comes to what their students are doing in classrooms and how technology could be playing a negative role in the learning process.
参考译文：教师必须警惕学生在课堂上的行为，以及技术在学习过程中可能扮演的负面角色。
定位线索：题干“teachers do in the classroom”→答案句取自第3段“Teachers must stay on guard”；文中“stay on guard”对应选项“Guard against”；文中“how technology could be playing a negative role”对应选项“students' misuse of technology”。
解析：题干问作者建议教师在课堂上做什么，答案句明确要求教师警惕技术可能带来的负面影响，对应D选项“防范学生滥用技术”。A选项“阻止学生过度使用电子设备”范围扩大，原文是警惕负面作用而非完全阻止；B选项“制定更有效的策略”是学校层面的建议；C选项“找到更多方法遏制不道德行为”过于笼统，未特指技术。