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　　Imagine you receive an e-mail that looks something like this：ARE YOU GOING TO CLASS TODAY?How does 　　1　　 this message make you feel?Why did the sender use 　　2　　 capital(大写)letters?Was he or she angry, 　　3　　 did that person just 　　4　　 to turn off the“Caps Lock”(大写锁定)on the computer．This e-mail“sounds”like the 　　5　　 is shouting because using all capital letters in an e-mail is 　　6　　 the way that people shout online．

　　Knowing when and when not to 　　7　　 capital letters is just one 　　8　　 of online etiquette(礼仪)．

　　Don't do anything online that you wouldn't do in 　　9　　 life．Don't use information that someone else has written, and 　　10　　 it's yours．Do share your knowledge of the Internet with others．

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阅读下列短文，从各题所给的A、B、C三个选项中，选出最佳选项。

　　Have you seen Avatar(《阿凡达》)? It's a popular 3D movie, and you may have to wear 3D glasses to see it．The 3D glasses make the images(图像)from the movie look as if they are coming straight at you．

　　More and more 3D movies are coming to theaters．Some say that 3D TV sets will come into our homes in the near future．Three－dimensional technology can make TV and movies more exciting．But people with eye problems may get headaches if they spend too much time watching 3D movies．Why?

　　When we look at an object(物体), each eye sees it at a different angle(角度)．Our eyes send the two images to our brain(大脑), and the brain puts them together．3D technology uses two film projectors(投影机)．One projects a left eye image and the other projects a right eye image．3D glasses allow us to see a different image in each eye．So, when we are watching a 3D movie, our brain can't put together the images sent to our eyes．The brain needs to work harder at “reading” the images．That makes it easier for these people to get dizzy(头晕的)or develop headaches．A famous eye doctor said if your eyes can't focus(聚焦)on the same object at once, you will have trouble watching 3D movies．

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