按照下面的步骤，不需要买那本书。 Free 3-month Amazon Prime Trial (no purchase necessary), Dec 29 Amazon again is offering Free 3-month Amazon Prime Trial. With Prime membership you can get free 2-day shipping on eligible items sold by amazon.com, which usually requires $25 or more for free 3-5 day shipping. Click here http://www.amazon.com/dp/0679405429/ref=nosim/?linkCode=as1&tag=d000001-20&m=ATVPDKIKX0DER click on red button: "Add to cart with Free 2-day shipping" in the right column, if you don't see it, make sure you are not logged in, you can log out first and go to the 1st step again Proceed to checkout At the confirmation page before submitting order, you would see that you are now a Prime Trial Member Now go to amazon.com homepage, click on Your account on the top, and manage your Prime Membership, cancel Auto Upgrade after trial feature, otherwise you will be charged $79 after trial for one year membership We confirm that you are eligible even you got a trial couple of months ago

虽然不怎么在amazon买，我也加了。 反正是免费的，如果需要就赚到了。