Scientists used nameless call data from more than six million cell phone users to help model a possible outbreak. And they concluded that viruses that spread from phone to phone by Bluetooth are not much concerned, because users have to be in close physical relation for their phones to“see”one another. However, viruses that spread through multimedia messaging services can move much faster, because they can come in disguise, such as a cool tune sent by a friend. The good news is that to be effective, these viruses need their victims to all use the same operating system, which not enough of us do. Because there is no Microsoft operating system for mobile phones, yet. Thank goodness. (272W)

　　1. What’s the passage mainly about?

　　A. The operating system of cell phones.

　　B. The threat of cell phone viruses.

　　C. The wide use of cell phones.

　　D. Computer viruses.

　　2. When　, cell phone viruses can be dangerous.

　　A. all the cell phones work on the same operating system

　　B. Microsoft operating system for cell phones is created

　　C. users can see each other on the phone

　　D. Bluetooth is widely used

　　3. What can we infer about Bluetooth according to the scientists?

　　A. It can increase the chances of cell phone viruses greatly.

　　B. It can help us to stop the spreading of cell phone viruses.

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