Your body works 24 hours a day. It's always building and repairing, feeding and cleansing itself. Its goal is to be ready for your every movement, breath, and thought. The quality of your life depends on how well your body works. And how well your body works depends on how much energy it gets. Energy comes from the food you eat. Food contains nutrients that your body needs for growth and energy. By eating a balanced diet, your body gets the six important nutrients it needs.Minerals are nutrients that build bones and teeth. Minerals also form red blood cells and other substances.Wateraids digestion and waste removal.Carbohydrates give your body its main source of energy. Two carbohydrates are sugars from foods such as fruits and vegetables and starches found in rice, potatoes, and bread.Fatshelp build cell membranes .Proteinsrepair and grow body tissues . Finally,vitaminshelp your body use carbohydrates, fats, and proteins. The United States Department of Agriculture(USDA) has created a nutritional food pyramid . It shows the daily number of servings you should eat from five food groups. The food pyramid has four levels. The base of the pyramid is the largest level. It contains the bread, cereal, rice, and pasta group from which you need six to eleven servings. The next level has two food groups: vegetables and fruits. The USDA recommends three to five servings of vegetables and two to four servings of fruit. The third level also has two groups: the milk, yogurt, and cheese group and the meat, poultry, fish, dry beans, eggs, and nuts group. You need two to three servings from each of these groups. The top of the pyramid is the smallest level. It contains fats, oils, and sweets. These foods have few nutrients, so eat them sparingly . A balanced diet _ . A) is made up of foods from five food groups. B) includes many foods containing fat. C) includes six to eleven servings of fruit. D) can be got by taking vitamins.
A
(Question)
Is there a limit to the number of years that a person can expect to live? Can changes in life-style add years to one's life? Throughout history people have sought answers to these questions and others. Various myths offer the hope of great longevity. In the imaginary land of Shangri-La, for example, people are said to lead a charmed existence for a thousand years. The Spanish explorer Ponce de Leon was convinced that he would find the Foundation of Youth in what is now the state of Florida. According to the Bible, Methuselah lived to be more than 900 years old. The subject of longevity is fascinating, and scientists study individuals such as Jeanne Calment to learn about the aging process. Calment died in 1997 in Arles, France, at the age of 122. She never married, and she lived in her own apartment until moving to a retirement community when she was 109. Most scientists agree that bodies will last, at best, about 125 years. This potential has changed little since modern human beings appeared more than 100 thousand years age. Recent improvements in medicine and the environment have extended life expectancy, especially for those from poorer parts of the world. It is not clear, however, whether such improvements will lengthen life expectancy beyond a certain point. Life expectancy is the number of years an infant can be expected to live, given the conditions into which it is born. Life expectancy, therefore, is affected by nutrition, medical care, and social and political circumstances. An individual's genetic makeup is also an important factor. Children from long-lived families can hope to enjoy long lives themselves. According to recent data, the average life expectancy worldwide in 1998 was 67 years. This can be compared with an average life expectancy of 77 in the United States. In 1970 the average life expectancy worldwide was 61 years, or 6 years less than it was in 1998. This same period saw a drop in infant mortality --- the death of a child before the first birthday---from 80 births out of 1,000 to 54... One can infer that people have at times imagined that _ . A) people live longer in the state of Florida B) a long life is a burden rather than a blessing C) it is possible to find a way to live for centuries D) life expectancy is affected by a couple of factors
(Answer)
C
Ques: Burmese pythons are some of the biggest snakes in the world and also one of the biggest problems in Florida's wetlands. So state officials have asked hunters to lend a hand. The pythons are originally from Asia. Brought to the US as pets or zoo animals, some were released or broke free into the wild and found Florida's warm weather to be perfect for a new settlement. It is estimated that tens of thousands now live in the everglades and the state's marshy wetlands. These supersize snakes are invasive species. "The problem is with animals," says Carli Segelson, spokesperson for the Florida Fish and Wildlife Conservation Commission. " The pythons eat native birds, reptiles, and small mammals, many of which are threatened species. " Since the python moved in, several native species, such as bobcats and rabbits, have largely disappeared from Florida's wetlands:' So the Florida government has invited hunters to assist in solving this severe environmental problem. People will be allowed to hunt pythons around their breeding grounds for one month, starting on January 12. Officials are even offering cash prizes to whoever kills the most pythons and to whoever kills the longest Burmese pythons. They are hoping the contest will significantly reduce the population of this dangerous invader. "Our goal is to help get rid of the pythons from the wild, educate the public about the snakes' impact on the Florida ecosystem, and inform them of what impacts non-native pets can have if allowed into the wild, " Segelson said. Experts say it's unlikely the snakes will ever be removed from the wild in Florida. But they hope to bring the python problem under control and prevent the snakes from doing more harm. The government's goal of hunting Burmese pythons is A) to drive off all the snakes B) to keep the balance of nature C) to prevent snakes from booming in number D) to provide necessities for others
Ans:
B