题目内容
SALT LAKE CITY, March 1, 2010 --- Like silkworm moths(蚕蛾), butterflies and spiders, caddisfly larvae(石蛾幼虫) spin silk, but they do so underwater instead of on dry land. Now, University of Utah researchers have discovered why the fly’s silk is sticky when wet and how that may make it valuable as an adhesive tape(黏胶带) during an operation.
“Silk from caddisfly larvae may be useful some day as a medical adhesive for sticking wet tissues,” says Russell Stewart, an associate professor of bioengineering and principal author of a new study of the fly silk’s chemical and structural properties.
“I picture it as sort of a wet Band-Aid, maybe used inside in operations --- like using a piece of tape to close a cut,” he adds. “Gluing things together underwater is not easy. Have you ever tried to put a Band-Aid on in the shower? This insect has been doing this for 150 million to 200 million years.”
There are thousands of caddisfly species worldwide. Some species spend their larval stages developing underwater, and build an inch-long, tube-shaped case or shelter around themselves using sticky silk and grains of rock or sand. Other species use silk, small sticks and pieces of leaves. Each larva has a head and four legs that stick out from the tube.The larval case gets wider as the larva grows.A caddisfly larva eventually pupates(化蛹)as it develops into an adult fly and then hatches.
Caddisflies now live around the world in waters ranging from fast streams to quiet low lying wet land. The caddisflies’adaptation to diverse habitats is largely due to the inventive use by their larva of underwater silk to build complex structures for protection and food gathering.
Caddisflies fall into two groups. Some build their case and then drag it along with them underwater as they search for food. Some build a shelter glued to a rock,with a silk net to catch passing food.
59.According to Russel Stewart, caddisfly larvae ______.
A. can spin silk underwater or on dry land
B.are worth researching
C.are quite different from butterflies and spiders
D.have been widely used in the medical field
60.The author mentioned “Band-Aid” in the passge to show ______.
A.Band-Aids are very useful
B. Band-Aids can’t be used in operations.
C. it’s not easy for caddisfly larvae to live underwater
D. silk from caddisfly larvae has an advantage over BandAids
61. The underlined word “it” in the last paragraph probably refers to ______.
A. the silk B. the shelter C. the food D. the rock
62. The passage is most probably a ______.
A. science fiction novel B. science news report
C. biography of researchers D. social affairs report
BDBB
Reading to dogs is an unusual way to help children improve their literacy skills（读写能力）. With their shining brown eyes, wagging tails, and unconditional love, dogs can provide the nonjudgmental listeners needed for a beginning reader to gain confidence, according to Intermountain Therapy Animals (ITA) in Salt Lake City. The group says it is the first program in the country to use dogs to help develop literacy in children, with the introduction of Reading Education Assistance Dogs (READ).
The Salt Lake City Public Library is sold on the idea. “Literacy specialists admit that children who read below the level of their fellow pupils are often afraid of reading aloud in a group, often have lower self-respect, and regard reading as a headache.” said Lisa Myton, manager of the children’s department.
Last November the two groups started “Dog Day Afternoon” in the children’s department of the main library. About 25 children attended each of the four Saturday-afternoon classes, reading for half an hour. Those who attended three of the four classes received a “pawgraphed” book at the last class.
The program was so successful that the library plans to repeat it in April. According to Dana Thumpowsky, public relations manager.
【小题1】．What is mainly discussed in the text?
| A．A special reading program. | B．Advantages of raising dogs. |
| C．Service in a public library. | D．Children’s reading difficulties. |
| A．dogs are young children’s best friends |
| B．dogs can provide encouragement for shy children |
| C．children can play with dogs while reading |
| D．children and dogs understand each other |
| A．accepts the idea put forward by ITA | B．uses dogs to attract children |
| C．has opened a children’s department | D．has decided to train some dogs |
| A．a book used in Saturday classes | B．a prize for the children |
| C．a book written by the children | D．a gift from parents |
In a country that defines itself by ideals, not by shared blood, who should be allowed to come to work and live here? In the wake of the Sept．11 attacks these questions have never seemed more pressing．
On Dec．11, 2001, as part of the effort to increase homeland security, federal and local authorities in 14 states staged “Operation Safe Travel”---raids on airports to arrest employees with false identification．In Salt Lake City there were 69 arrests．But those captures were anything but terrorists, most of them illegal immigrants from Central or South America．Authorities said the undocumented workers’ illegal status made them open to blackmail（讹诈）by terrorists．
Many immigrants in Salt Lake City were angered by the arrests and said they felt as if they were being treated like disposable goods．Mayor Anderson said those feelings were justified to a certain extent．“We’re saying we want you to work in these places, we’re going to look the other way in terms of what our laws are, and then when it’s convenient for us, or when we can try to make a point in terms of national security, especially after Sept．11, then you’re disposable．They are whole families being uprooted for all of the wrong reasons,” Anderson said．
If Sept．11 had never happened, the airport workers would not have been arrested and could have gone on quietly living in America, probably indefinitely．Ana Castro, a manager at a Ben & Jerry’s ice cream shop at the airport had been working 10 years with the same false Social Security card when she was arrested in the December airport raid．Now she and her family are living under the threat of deportation（驱逐出境）．Castro’s case is currently waiting to be settled．While she awaits the outcome, the government has granted her permission to work here and she has returned to her job at Ben & Jerry’s．
【小题1】How did the immigrants in Salt Lake City feel about “Operation Safe Travel”?
| A．Guilty | B．Offended | C．Disappointed | D．Discouraged |
| A．evidence was found that they were potential terrorists |
| B．most of them worked at airports under threat of terrorists |
| C．terrorists might take advantage of their illegal status |
| D．they were reportedly helping hide terrorists around the airport |
| A．there are other ways of enforcing the law |
| B．we will examine the laws in a different way |
| C．we will turn a blind eye to your illegal status |
| D．the existing laws must not be ignored |
Salvation Army Angel Program
Angel Tree collects gifts for children and families in need. Participate by selecting an angel from any Angel Tree at all Cyprus Credit Union location or any Utah Macy's Department store. Shop for your angel, then return your new, unwrapped gift to the same Angel Tree. Gifts must be returned before December 14. For more information, call (801) 988-5678 in the Salt Lake area,(801) 374-2588 in the Provo area.
Utah Association for People with Intellectual Disabilities Holiday Gift Box Program
The program serves primarily low-income adults with intellectual disabilities who don't qualify for other programs because of age limits, said Joyce Whalen, the association's board president. To donate, visit the association at 1326 S.2100 East from 9am to about 5:30 pm to choose an ornament(装饰物) that provides information about an individual who will benefit from the program. Shop for new items and return them by December 14. Donations of generic items, such as towels, socks and hygiene products also accepted, as are monetary donations. For more information, call 801-440-1674.
Utah Foster Care Foundation's Giving Tree Program
The program seeks new gifts and cash donations to fulfill the holiday wishes of more than 1,000 children in state-licensed foster homes." Many of the children in care have been removed from their biological homes because of neglect or abuse," said Nikki Mackay, the foundation's director. " Christmas can be a difficult time for them." To learn how to support the program, call 877-505-5437.
Utah State Hospital Forgotten Patient Program
The program provides Christmas gifts for hundreds of patients with mental illness. In the history of the program--which may go back as far as 60 years, organizer Shawna Peterson said, "we've never had a forgotten patient." And she doesn't want this year to change that. To support the program, contact Peterson at 801-344-6088.
【小题1】After you buy an angel, you should ________.
| A．post it to where you bought | B．open its package to examine it |
| C．send it to families in need for yourself | D．bring it back in its original form |
| A．801-440-1674 | B．801-988-5678 |
| C．877-505-5437 | D．801-344-6088 |
| A．homes where they are just brought up |
| B．homes where their natural parents live |
| C．homes where they learn biology |
| D．homes where are related to bacteria |
A. the patients often forgot to come to the hospital
B. the patients are often forgotten to be looked after
C. the patients are being taken good care of
the patients had a poor memory in the hospital
