参考答案：网上购物十分便捷，如今很多人感到没它就无法生活。但谈到在网上购买药品，医生告诫消费者必须谨慎。

解析：[听力原文]
Shopping online is a convenience that many people now feel they couldn’t do without, but when it comes to purchasing medications on the Web, doctors are warning buyers to beware.