题目

p或q的否定为：非p且非q；p且q的否定为： 答案：非p或非q.阅读短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。IMPROVE ON SLEEPGood health needs good sleep. Going to bed before you’re tired. No eating or reading in bed. Go to bed at the same time before midnight and get up at the same time. Your body likes routine (常规) for a good night’s sleep.STAY FREE OF FLU Studies show that a cold or flu virus （病毒） can live on our hands for long. So wash all parts of your hands frequently with soap and water. For more ways to prevent the spread of flu, please call the Health Line at 1800 848 1313.ORAL (口腔) HEALTH Brush your teeth twice a day and visit the dentist at least once a year. The mouth is a mirror of disease. The oral examination is not only for the health of teeth, but the whole body. For more of it, please visit www. mydr. com. au.FIT FOR LIFE Studies have shown that many diseases have something to do with little or no physical (身体) activity. Try to do it for 30 minutes a day, 5 days or more a week. For more information, please call the Health Line at 1800 438 2000.【1】If you want to get a good sleep, you’d better _______.A．go to bed after you’re tired B．go to sleep at midnightC．follow the bedtime routine D．eat something or read in bed【2】To prevent from catching a cold or flu, it’s good for you _______.A．to clean your fingers often B．to brush your teeth twice a dayC．to get up early every morningD．to wash all parts of your hands【3】You should visit the dentist at least once a year, because _______.A．the oral examination is necessary B．you don’t often brush your teethC．some diseases may be in the mirrorD．you don’t have a good night’s sleep【4】Studies have shown that many diseases have something to do with _______.A．having no oral examination B．washing hands with cold waterC．sleeping too late sometimes D．doing little physical activity【5】If you want to learn more about the flu, you can _______.A．visit www. mydr. com. Au B．call the Health Line at 1800 848 1313C．visit the dentist in your placeD．call the Health Line at 1800 438 2000