[多项选择]表现为甲状腺弥漫性、对称性肿大的疾病有（）。
A. 单纯性甲状腺肿
B. 结节性甲状腺肿
C. 毒性甲状腺肿
D. 桥本甲状腺炎
E. 急性甲状腺炎

Water
From the beginning, water has furnished man with a source of food and a highway to travel upon. The first (51) arose where water was a dominant element in the environment, a challenge to man’s ingenuity. The Egyptians invented the 365-day calendar (52) the Nile’s annual flooding. The Babylonians, who were among the most famous law-makers in ancient times, invented laws (53) water usage. Water inspired the Chinese to build a 1,000- (54) canal, a complex system which, after nearly 2,500 years, remains still practically (55) and still commands the astonishment of engineers. But the (56) never found complete solutions to their water problems. The Yellow River is also known (57) "China’s Sorrow"; it is so unpredictable and dangerous (58) in a single flood it may cause a million (59) . Floods slowed the great civilization of the Indus River Valley, and inadequate drainage rui
A. injuries
B. deaths
C. damages
D. ruins

For most of us, body weight goes up with age—an average of one pound a year after 25, according to the American Medical Association. We can fight against body weight through exercise and the right dietary (饮食的) habits, according to the National Institute on Aging.
Consult your physician before beginning any diet or exercise program. Whichever activity you choose, start slowly—say ten minutes a day—and over the next six to eight weeks, build up to at least 30 minutes three to four times a week. "Grade your exercise between one and ten," suggests Dr. Richard Stein, "with one being not very tired and ten being exhausted. A comfortable exertion (费力) level between six and eight is what you should aim at."
In planning your diet, consider these tips: 1. Eat several small meals a day—as many as six. 2. Don’t skip breakfast. 3. Make the last meal of the day a small one. 4. A variety of foods is important for good health. Bu