version should be ignored.

Writing the wrong name

The sooner you notice, the better. Respond quickly and briefly, apologizing for your mistake. Keep the tone measured: don't handle it too lightly, as people can be offended, especially if your error suggests a misunderstanding of their culture.

Clicking "reply all" unintentionally

You accidentally reveal to entire company what menu choices you would prefer at the staff Christmas dinner, or what holiday you'd like to take. In this instance, the best solution is to send a quick, light-hearted apology to explain your awkwardness. But it can quickly rise to something worse, when everyone starts hitting "reply all" to join in a long and unpleasant conversation. In this instance, step away from your keyboard to allow everyone to calm down.

Sending an offensive message to its subject

The most awkward email mistake is usually committed in anger. You write an unkind message about someone, intending to send it to a friend, but accidentally send it to the person you're discussing. In that case, ask to speak in person as soon as possible and say sorry. Explain your frustrations calmly and sensibly-see it as an opportunity to hear up any difficulties you may have with this person.

21. After realizing an email accident, you are likely to feel _______.

　A. curious B. tired C. awful D. funny

22. If you have written the wrong name in an email, it is best to ________.

　A. apologies in a serious manner B. tell the receiver to ignore the error

　C. learn to write the name correctly D. send a short notice to everyone

23. What is the passage mainly about?

　A. Defining email errors. B. Handling email accidents.

　C. Reducing email mistakes. D. Improving email writing.

B

Researchers at Birmingham found about one in five teenagers now have some degree of hearing damage. The researchers did not say why hearing loss has risen, but other experts have strong suspicions. One likely criminal, they say, is MP3 players.

An MP3 player can be dangerous to hearing when its decibel (分贝) level is turned up too high. High-decibel sounds can damage nerve endings, called hair cells. If a sound is loud enough, the damage can be permanent. A loud sound can shake the membrane (薄膜) on which the hair cells sit "like an earthquake". That shake can break or even uproot hair cells. When that happens, the hair cells are finished. Human ears cannot regrow hair cells. Therefore, when listening to an MP3 player, set a volume limit and avoid exposure to loud sounds.

On the other hand, the loudness of today's music may not be totally under your control. Music companies have been purposely turning up the volume. It's a trend called the fight for loudness.