考研英语长句解析答案如下：
1. 原句：The rapid development of technology has brought about significant changes in our daily lives, which has led to both opportunities and challenges.
解析：这句话的主干是"The rapid development of technology has brought about significant changes in our daily lives"，意为“技术的快速发展给我们的日常生活带来了重大变化”。其中，“which has led to both opportunities and challenges”是定语从句，修饰“significant changes”，表示“这些变化既带来了机遇，也带来了挑战”。
2. 原句：It is widely believed that the Internet has revolutionized the way we communicate, making it easier for people to share information and ideas.
解析：这句话的主干是“It is widely believed that the Internet has revolutionized the way we communicate”，意为“人们普遍认为，互联网彻底改变了我们的沟通方式”。其中，“making it easier for people to share information and ideas”是现在分词短语作结果状语，表示“使人们更容易分享信息和观点”。
3. 原句：The increasing use of smartphones has raised concerns about the potential negative effects on individuals' physical and mental health.
解析：这句话的主干是“The increasing use of smartphones has raised concerns”，意为“智能手机的日益普及引起了人们对某些潜在负面影响的担忧”。其中，“about the potential negative effects on individuals' physical and mental health”是介词短语作宾语，表示“对个人身心健康可能产生的负面影响”。
【考研刷题通】——你的考研刷题小助手！涵盖政治、英语、数学等全部考研科目，海量真题、模拟题，助你轻松备战考研！快来加入我们，一起刷题冲关吧！微信搜索“考研刷题通”，开启你的考研刷题之旅！