The notable new messaging feature on the iPhone 3GS is support for MMS. You can send pictures and videos by SMS, rather than having to send them via e-mail. Other new and very-handy e-mail features include the ability to search through your e-mail messages and contacts, as well as the option to use a landscape-oriented keyboard when composing messages.

　　The camera has been upgraded from 2 megapixels(兆像素) to 3 megapxiels, and adds auto-focus. If you already own an iPhone 3G, the iPhone 3GS may not be worth the additional cost, since you can get many of its cool features for free with the iPhone 3.0 software upgrade. But if you've been using an older iPhone or smart phone, or are new to the smart phone world, the iPhone 3GS will amaze you with its speed and plentiful features.

　　1. The difference between 3G and 3GS lies mainly in ________.

　　A. their colors

　　B. their outside shapes

　　C. their screens

　　D. their batteries and speeds

　　2. What can we infer from the second paragraph about 3G?

　　A. It offers an easy access to the web pages.

　　B. It has two versions: either black or white.

　　C. In spite of slow speed, it functions the same as 3GS.

　　D. It has the latest iPhone software installed.

　　3. What does MMS probably refer to in the passage?

　　A. Multi-media Messaging Service.

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