题目

2019年1月3日，“玉兔二号”月球车在月球背面成功着陆。关于月球车，下列说法正确的有（） A .在月球表面的质量和地球表面的质量相等 B . 在月球表面受到的重力和在地球表面受到的重力相等 C . 发射过程中，有一个绕地球匀速转动的过程，这个过程受力不平衡 D . 发射过程中，有一个匀速竖直向上远离地球的过程，这个过程机械能守恒阅读理解。     Mary is reading something about how to keep healthy on the Internet.     Good sleep is important for your health. You need about eight hours’ sleep a night. Don’t eat or read in bed. A cup of milk before sleeping may help you get a good sleep. Go to bed before 10:00 and get up early every morning. For more information, please visit www. sleeping. com.     How often do you exercise? If you want to stay healthy, you should do a lot of exercise. Try to exercise for 30 minutes a day, three or four times a week. For more information, please call Health Line at 180-2000.      Studies show that the cold or flu virus(流感病毒) can live on our hands for long. So you should wash your hands often with soap and water. If you want to know more, please call Health Line at 180-1313.Brush your teeth twice a day. And see a dentist at least (至少) once a year. The oral examination(口腔检查) is not only for the health of teeth, but the whole body. Please visit www. mydr. com for more information.      1. If you want to get a good sleep, you should             before sleeping.         A. stay upB. read in bedC. drink some milkD. eat something2. You should do exercise              to keep healthy.A. many hours every dayB. ten minutes every dayC. 30 minutes a weekD. about 2 hours a week3. To prevent from catching a cold or flu, it’s good for you            .       A. to wash your hands oftenB. to brush your teeth twice a dayC. to get up early every morningD. to eat some healthy food4. You should visit the dentist at least once a year, because            .        A. you don’t often brush your teethB. the oral examination is necessaryC. it is good for the dentistsD. it can only keep your teeth healthy5. If you want to learn more about flu, you can             .       A. visit www. sleeping. com.B. call Health Line at 180-2000C. call Health Line at 180-1313D. visit www. mydr. com