题目

If you have a toothache, you should ________.A. go to school B. play sports C. see a dentist D. lie down and rest 答案：【答案】C【解析】句意：如果你牙疼，你应该看牙医。go to school去上学，play sports做运动，see a dentist看牙医，lie down and rest躺下休息。根据If you have a toothache,可知你牙疼，应是去看牙医，故选C。用惰性电极电解下列溶液，在阴、阳两极生成气体的体积比为1∶1的是(     )A．溶液B．溶液C．溶液D．溶液