【文章內(nèi)容簡(jiǎn)介】 e too warm； if the mattress is too light he may feel cold during the night. The bedroom itself may be overheated or too cold. If it is not dark enough， or too noisy， this 正保遠(yuǎn)程教育 （美國(guó)紐交所上市公司 代碼 ： DL） _____________________________________________________________________ [9] 人事考試教育網(wǎng) 01082333888（ 24 小時(shí)） may cause difficulty in sleeping. Eating shortly before going to bed may also be responsible for insomnia. Drinks， such as tea or coffee， can also deep people awake. Inability to fall asleep is sometimes a symptom of emotional or mental disorder. The cause of insomnia may be easy to correct. The sufferer should check the mattress， and bedroom temperature， and make any necessary changes. He should relax for an hour or two before bedtime， perhaps by reading a book， watching television or taking a warm bath. If he wakes during the night he should try turning on the light and reading for a while. Take warm milk and a biscuit or two may be helpful. Above all， he should try not worry about sleeplessness —— when someone is tired enough he nearly always falls asleep. to the passage， insomnia is serious disease mon plaint sign of illness usual problem to the passage， people who has difficulty in sleeping should sleep in dark and quiet room light and warm room cold and quiet room dark and warm room to the passage， if a person wants to fall asleep fast he shouldn39。t anything during supper time any books before he goes to bed television shortly before going to bed anything that will keep him awake. 正保遠(yuǎn)程教育 （美國(guó)紐交所上市公司 代碼 ： DL） _____________________________________________________________________ [10] 人事考試教育網(wǎng) 01082333888（ 24 小時(shí)） to the passage， what is the worst aspect of insomnia？ too much television too much before going to bed about sleeplessness too much at night to the author， insomnia shouldn39。t be a serious problem because cause can be corrected by making oneself feel tired enough. can cure it easily people can catch up on their sleep during the day people don39。t need so much sleep. 第二篇 Human Heart Can Make New Cells Solving a longstanding mystery， scientists have found that the human heart continues to generate new cardiac cells throughout the life span， although the rate of new cell production slows with age. The finding， published in the April 3 issue of Science， could open a new path for the treatment of heart diseases such as heart failure and heart attack， experts say. “We find that the beating cells in the heart， cardiomyocytes， are renewed， ” said lead researcher Dr. Jonas Frisen， a professor of stem cell research at the Karolinska Institute in Stockholm， Sweden. “It has previously not been known whether we were limited to the cardiomyocytes we are born with or if they could be renewed， ” he said. The process of renewing these ceils changes over time， Frisen added. In a 20yearold， about 1 percent of cardiomyocytes are exchanged each year， but the turnover rate decreases with age to only percent by age 75. “If we can understand how the generation of new cardiomyocytes is regulated， it may be potentially possible to develop pharmaceuticals that promote this process to stimulate regeneration after， for example， a heart attack， ” Frisen said. 正保遠(yuǎn)程教育 （美國(guó)紐交所上市公司 代碼 ： DL） _____________________________________________________________________ [11] 人事考試教育網(wǎng) 01082333888（ 24 小時(shí)） That could lead to treatment that helps restore damaged hearts. “A lot of people suffer from chronic heart failure， ” noted coauthor Dr. Ratan Bhardwaj， also from the Karolinska Institute. “Chronic heart failure arises from heart cells dying， ” he said. With this finding， scientists are “opening the door to potential therapies to having ourselves， ” heal ourselves Bhardwaj said. “Maybe one could devise a pharmaceutical agent that would make heart cells make new and more cells to overe the problem they are facing.” But barriers remain. According to Bhardwaj， scientists do not yet know how to increase heart cell