题目内容
You file your income taxes online. This is an example of _________ e-commerce.
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You use your smartphone to look up how much money you have in your bank account. This is an example of _________ commerce.
In ________, manufacturers or retailers sell directly to customers.
In ________, vendors ask partners to place logo on the partner’s website and then pay that partner a commission.
In ________, recipients of your marketing notices send information about your product to their friends.
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