—How long does it take us to go to your hometown from here?

—It takes us _______ hour or more to go to my hometown by _____ train.

A. an; a B. an; / C. a ; an D. a; /

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How long are you willing to wait for a webpage to open before you start to lose your patience? Half a minute? A few seconds?

Google engineers have discovered that even 400 milliseconds ― as short as the blink (眨眼) of an eye ― is too long for most Internet users.

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Achieving a higher speed has always been part of the history of the Internet.

In the 1990s, when the World Wide Web first started to become popular, it was very crowded and slow; people called it the “World Wide Wait”. But engineers managed to fight the problem with new inventions. They improved software so it would work more smoothly; they made computer servers all around the world nearer to users; all these increased speed.

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They buy tickets or turn off their TV sets. People play

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a room， but sometimes they play inside.We can finding

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sports here and there. Some sports are interested

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and people everywhere like it. Football， for example，

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is very popular that we can see

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