题目

灵灵只和她的同桌说话，不和其他同学说话。 答案：错误School homework , use of electronic devices are major causes, report says. More than 60 percent of children and teens do not get adequate sleep, which can put their health at risk, according to a report released on Sunday by the Chinese Sleep Research Society. Nearly 63 percent of Chinese youths aged 6 to 17 sleep less than eight hours a day, according to the report. Among 13 to 17-year-olds the figure is more than 81 percent. The report was based on a survey at the end of last year and in January. It covered nearly 70,000 children and teens aged 6 to 17 across the Chinese mainland, Hong Kong, Macao and Taiwan.The report found that the heavy school homework load and the popularization of electronic devices were the two top causes for the inadequate sleep. From Monday to Thursday, 8. 4 percent of the group would still be busy with their homework after 11 pm. More than 41 percent of children and teenagers who sleep too little use electronic devices such as computer tablets and mobile phones, the survey found, and youths whose parents uses smartphones in front of them are more likely to have less sleep.Other factors, such as noise and light pollution , contributed to the problem, the report said.The survey also indicated that good sleep results in higher efficiency in study. Students who sleep longer generally finish homework in two and three hours per day, while those who sleep lessrequire four to six hours.Gao Xuemei, vice-president of the society, said studies have shown that decreasing (减少)sleeping time for children and teenagers has been a global trend in the past 10 years, but the problem appears to be worse in East Asia, including China, largely clue to a heavier load of schoolhomework." Lack（缺失）of sleep among children and teenagers deserves high attention, because it can seriously affect their health and growth, " she said. Such a group should sleep at least eight hours aday, she added."Sleep promotes growth, protects the brain and improves the immune（免疫）system, " she said. "Long-term deprivation of sleep will bring risks of diseases and conditions such as dementia and cause lasting health damage. "【1】The word " adequate" in Paragraph 1 probably means .A.enoughB.muchC.necessaryD.Desired【2】From the passage we can learn .A.the more children sleep, the higher their grades areB.parents influence their children less if they use smartphonesC.noise and light pollution play an important role in the sleeping problemD.children in East Asia may lack more sleep than those in other parts of the world【3】The writer wants by the passage.A.to find out the reasons for youths' inadequate sleepB.to stop children and teenagers using electronic devicesC.us to cut down children and teenagers' heavy school homeworkD.us to pay high attention to lack of sleep among children and teenagers