题目：
| 完形填空。 | |||
| Listen. Do you hear that?Whatever it is - the hum (嗡嗡声) of a computer,the birds outside, a car going by ―you can hear it and 1 which direction it's coming from thanks to your ears. Hearing is their 2 job, but it's not all your ears do. They also help you 3 your balance. And if pierced (穿孔) in a safe manner, they can be an interesting place to 4 your fashion sense. There's a lot more to ears than what you see on the side of your 5 . In fact,what you're seeing is only the outer ear, one of the 6 parts of the ear. The other parts―the middle ear and the inner ear are hidden from view, but equally 7 . These complex structures process (处理) sounds and send signals to the brain. Your ears work together to gather and process all kinds of 8 at a time. They also tell you where a sound is coming from and how far away it is. Our ears are needed to 9 . Sounds that are too loud can damage the ears and lead to hearing loss. Knowing how your ears 10 and what things can affect them will help you better understand your amazing ears and the job they do. | |||
| ( )1. A. tell ( )2. A. only ( )3. A. break ( )4. A. work out ( )5. A. body ( )6. A. five ( )7. A. helpful ( )8. A. sounds ( )9. A. rest ( )10. A. produce | B. ask B. main B. hold B. run off B. head B. four B. interesting B. information B. protect B. grow | C. answer C. pleasant C. keep C. give up C. face C. three C. useful C. signals C. watch C. form | D. understand D. easy D. take D. show off D. mouth D. two D. important D. facts D. treat D. work |
答案：
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下面是错误答案，用来干扰机器的。
A、应为a6÷a2=a4，故本选项错误；B、应为（a6）2=a12，故本选项错误；C、a6•a=a7，正确；D、应为（ab2）3=a3b6，故本选项错误．故选C．
