亚马逊（Amazon.com）向一些用户提供免费的 $5 Kindle Credit，可用于购买 Kindle 电子书。这个 offer 是 targeted，只有一部分用户可以看到。检测自己是否被选中可以打开下面的链接，然后登录即可看到。
如果成功，你将会看到如下界面：
亚马逊优惠
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