题目内容
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America’s greatest technological achievement, the Hoover Dam, now has a companion piece, a bridge held up by the longest arch in the Western Hemisphere(半球). The Mike O’Callaghan-Pat Tillman Memorial Bridge, which opened this month and connects the U.S. states of Arizona and Nevada, crosses the vast chasm(峡谷)890 feet above the Colorado River that is controlled by the dam.
The striking 1,900-foot-long structure will improve traffic in the region and help protect the dam from being destroyed. It is the seventh highest bridge in the world, behind four in China, one in Papua New Guinea and one in the US state of Colorado.
“The Hoover Dam is the greatest civil engineering achievement in America’s history,” said the bridge project manager Dave Zanatell. “Our goal was not to outdo or outshine it. Our goal was to, in a respectful way, do something that would be great for our generation and that would stand besides Hoover Dam in a respectful and quality way that would become a part of Hoover’s legacy(遗产).”
Just as the Hoover Dam was built in the heart of the Great Depression(大萧条)and was seen as an example of the nation’s can-do spirit, some hope this project can also provide some uplift.
The bridge is surprising: at 1,050 feet, its support arch holds up a roadway that lies on 300-foot-long concrete pillars(柱子), some of the tallest in the world. It contains 16 million pounds of steel.
The idea of the bridge came into being in the 1960s because the top of the Hoover Dam has been a narrow two-lane road that is the fastest route from Arizona to Las Vegas and then the Pacific Northwest and Canada.
Access to the dam from each direction is a dangerously winding route, but massive trucks and passenger vehicles shared it for decades. During the day, when thousands of tourists travel to the dam from Las Vegas three times as many accidents as on a normal road will happen.
The bridge has a sidewalk on the side facing the dam. The wall on both sides is 54 inches high, so walkers can take photos there.
【小题1】Which of the following is true of the Hoover Dam?
A.It was completed recently. |
B.It was built during the hard times. |
C.It has the longest arch. |
D.It’s the seventh highest dam in the world. |
A.To protect the dam. | B.To save the cultures. |
C.To outdo the dam. | D.To develop the tourism. |
A.lift of the heavy object | B.support in money |
C.spiritual encouragement | D.instruction in technology |
【小题5】The text is mainly about ______.
A.the Hoover Dam |
B.American western development |
C.a tour along the Colorado River |
D.a recently built bridge |
( D )
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(矿物质) are nutrients that build bones and teeth. Minerals also form red blood cells and other substances. Water aids digestion and waste removal. Carbohydrates(碳水化合物) 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. Fats help build cell membranes(膜). Proteins repair and grow body tissues(组织). Finally, vitamins help your body use carbohydrates, fats, and proteins.
The United States Department of Agriculture(USDA) has created a nutritional food pyramid(金字塔). 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(有节制地).
【小题1】What is the main idea for this passage_________?
A.Eating a balanced diet gives your body the energy it needs. |
B.The top of the pyramid is the smallest level. |
C.Meat, poultry, fish, dry beans, eggs, and nuts are on the third level. |
D.We should have a nutrition food pyramid. |
A. food is something that cleanses your body. |
B.food can improve the quality of your life. |
C.food should be eaten at night as well as during the day. |
D.food will make it easier for you to exercise. |
A.four | B.five | C.six | D.seven |
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.describes the five basic food groups. |
B.explains what a balanced diet is. |
C.writes the details of each nutrient. |
D.tells the number of daily servings needed from each food group. |