Like many thickly populated urban neighborhoods, Lincoln Park also has rats. A lot of rats. “Every night when I walk down the sidewalk, I see rats, ” says 36-year-oId Kelly McGee, who has come to accept this aspect of city living. “It's an urban area; I don't know what else we can expect.”

McGee lives just down the block from the old Children's Memorial Hospital, which is about to be torn down as part of a massive redevelopment project. “Construction all over the city often disturbs rats that are living underground,” says Lincoln Park's City Council representative, Alderman Michele Smith. “Every developer has to do active rat reduction on site, ”Smith says. Already, there are poisonous and inviting food boxes all around the old hospital complex. But the developer of the hospital site still warned residents in a recent community meeting that when digging begins later this month, the rat problem could be awful.

Victoria Thomas, who lives a few miles north of Lincoln Park in Chicago's Lake View neighborhood, says she tried everything from underground fencing to poison traps to wipe out rats, but nothing worked until she got some cats. From the first day she got the cats, Thomas says the rats started to disappear.

“The cats will kill off a great deal of the initial population of the rats, ”says Paul Nickerson, who manages the Cats at Work program for Tree House Humane Society. “And through spreading their pheromones, a chemical produced by an animal, the cats will keep other rats from filling their absence.” Nickerson says that is what makes the cat program so successful in keeping rats away for the long term. ” The rats are far from stupid. They smell the cats' pheromones so they'll stay out of the cats' territory(领域).”

    After Smith highlighted the program in a recent newsletter, Nickerson and Tree House Humane Society have been getting lots of calls from people seeking their own cat colonies. That means a lot more wild cats that might otherwise be killed out of pity will be cared for while doing something that they love: hunting rats.

    New Sciencenter Featured Exhibition: Ocean Bound!

    Opening weekend

    Member Preview: Friday, February 3, 6—8 pm

    Public Opening: Saturday, February 4, 10 am — 5 pm

    Start a journey through watersheds to see how everyone's actions affect the health of our ocean. Enjoy interacting with 3D watershed models, piloting a full-size submersible from mountain stream to ocean, guiding water safely through a hazardous maze, diverting pollutants as they travel through storm-water drains, playing with early education exhibits inside a clubhouse, and many more engaging interactive exhibits.

    Showtime! Plant and Animal Double-Takes

    Saturday, January 21, 2 pm

    Have you ever looked at a living thing and wondered, Is that a plant or an animal? Join Sciencenter educators Julie Yurek and Sarah Cox to look into species that make you take a second look. Explore the surprising differences between these plants and animals.

    Showtime! Solar Power Goes Nano

    Saturday, February 11, 2 pm

    Did you know scientists are using nanotechnology to store solar energy? Learn about solar power and the emerging use of hydrogen fuel cells. Justin Sambur, NSF Postdoctoral Research Associate at Cornell's Department of Chemistry and Chemical Biology, will demonstrate a model race car that uses a hydrogen fuel cell kit powered by solar energy.

    Special Showtime! Presentation: Animal Adaptations for Winter

    Wednesday, February 22, 1 pm

    Have you ever wondered how animals survive in winter? Join Emma Brofsky of Cornell's Naturalist Outreach Program to explore animal adaptations for winter and learn how biology helps animals cope with cold weather, food shortages, and limited habitats. Touch animal pelts and do a hands-on activity on animal insulation.

    Two thieves came to a house to steal something, they dug a hole in the wall of the house.

    There lived many mice in the house. The woman in the moonlight saw a mouse crawl (爬行) into the house. “Look! In comes one,” she said to the man in the house. He was so frightened that he hurriedly crawled out of the house and said to the one waiting outside, “She found me when I was just in.” But the thief outside didn't believe him, so he said, “Let us two try to crawl into the house together.” At that time two mice happened to crawl into the house, too. The woman saw the mice and shouted, “In come two, catch them!” The two thieves were terribly frightened. The man in the house said, “You saw them come in but where are they? I will catch them tonight.” The two thieves started running away at once.

    The two thieves wanted to make it clear whether they had been found or not the night before. The next day they acted as men selling sweet potatoes and came before the house. The man and the woman were ploughing in their fields. The rein (缰绳) broke and the woman came home for a rope. She saw two men selling sweet potatoes and wanted to buy some. She picked out two which looked like mice. At the time the man couldn't wait for her any longer in the fields and he ran back from the fields to hurry her up. The woman showed the sweet potatoes to the man and said, “How they look like the two of last night.” The man said, “I asked you to fetch a rope, why don't you hurry for it?” The two thieves ran away very quickly without their sweet potatoes.

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    The Price of Success

    One problem for schools is that many students do not want to study hard. As a result, they perform (表现) poorly in their classes. This is especially true in the United States, where average scores for math and science are lower than in many other countries. In recent years, schools and charities have been looking for ways to help students get better grades in these subjects. An organization called the LMD Foundation introduced a program called Learn and Earn recently.

    In the program, money was used to get a group of students to study harder in math and science. In addition to the normal school day, they went to after-school classes for four hours each week. The students were paid eight dollars for each hour of after-school class. By the end of the year, the students in the program had higher grades than a similar group of students who had not taken part.

    Not everyone thinks that this is a good idea, though. TV reporter John Tulenko studied data (数据) from a similar program. He found that students' grades went back down when they stopped getting paid. Many people are worried about this. They think that the students study because they want money, not because they enjoy learning. Also, some people believe that these types of programs are a bad idea because it is a large part of a teacher's job to get students to study. If students are given money, some teachers might stop trying to do this.

    However, others believe that these learning programs can be helpful for students from poor families. Many of these students do part-time jobs after school, and some even quit school at a young age to work. Some do this to help get money for their families. Others feel that they can learn more by working than by going to school. Programs like Learn and Earn let these students stay in school and still make money.

    Reading can be a social activity. Think of the people who belong to book groups. They choose books to read and then meet to discuss them. Now, the website BookCrossing.com turns the page on the traditional idea of a book group.

    Members go on the site and register the books they own and would like to share. BookCrossing provides an ID number to stick inside the book. Then the person leaves it in a public place, hoping that the book will have an adventure, traveling far and wide with each new reader who finds it.

    Bruce Pederson, the managing director of BookCrossing, says "The two things that change your life are the people you meet and books you read. BookCrossing combines both."

    Members leave books on park benches and buses, in train stations and coffee shops. Whoever finds their book will go to the site and record where they found it.

People who find a book can also leave a journal entry describing what they thought of it. E-mails are then sent to the BookCrossers to keep them updated about where their books have been found. Bruce Pederson says the idea is for people not to be selfish by keeping a book to gather dust on a shelf at home.

    BookCrossing is part of a trend among people who want to get back the "real" and not the virtual(虚拟). The site now has more than one million members in more than one hundred thirty-five countries.