题目内容
_______ e-mail accounts do not require an e-mail program to be installed on your computer.
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Unsolicited e-mail is called _______.
_______ messaging is the process of sending short electronic messages using a wireless network.
A(n) _______ publishes short sentences that only take a few seconds to write, rather than long stories or posts.
The most popular microblogging site is _______.
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