英语三级B级
单选题What is this, passage mainly about?
参考答案：A进入在线模考
本题答案：A。主旨题。本文将在线购物和商店购物以及邮购的安全性进行比较，提出了确保网上购物安全的ABC法则，所以文章主要是关于如何安全地在网上购物。
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