Problem:OPTIONS:
- To show Chinese is badly polluted by English.
- To express the couple's love for the child.
- To indicate "@"is a very common sign among the e-mail users.
- To show some people are very enthusiastic over English letters.

Read the following article and answer the question. Article: Does technology pose a threat to the purity of Chinese language? Many Chinese use instant messenger tools such as MSN or QQ, listen to music on MP3 players and log on the Internet using ADSL--most without knowing the literal Chinese translation of the abbreviations . But they don't have to, as many English letters have become part of the local vocabulary. A dozen abbreviations including GDP, NBA, IT, MP3, QQ, DVD and CEO are among the 5,000 most-frequently used words in the Chinese media last year, according to a report on the 2006 Language Situation in China. The report said some parents are so keen on English letters that a couple tried to name their baby "@", claiming the character used in email addresses reflects their love for the child. While the "@"is obviously familiar to Chinese e-mail users, they often use the English word "at" to pronounce it "ai ta",or "love him". The study collected more than 1 billion language samples from newspapers, magazines, TV, radio and websites. The annual report is jointly compiled by the Ministry of Education and the State Language Commission. "Nowadays, more and more English abbreviations are being used in Chinese, making them an important part of modern language," said Hou Min, a professor at Communication University of China. "The abbreviations have gained popularity because of the ease of usage," Hou said. For example, DNA is much simpler to use than its Chinese version. "As more Chinese people learn foreign languages, especially English, in recent years, using abbreviations has become a trend among educated people," she added. Some language scholars fear such usage will contaminate the purity of Chinese and cause confusion in communication. Question: Why does the author use the example of a couple who tried to name their baby "@"? Answer:
****
A: To show some people are very enthusiastic over English letters.

Problem:OPTIONS:
- Creative.
- Impressive.
- Persuasive.
- Imaginative.

Read the following article and answer the question. Article: When Russell Lyons volunteered for the first time, he read "Goodnight Moon" to a class of San Diego preschoolers. And it wasn't reading--he'd memorized the book and was reciting it out loud. He was 4. Still, he said it felt good up there, in front of the other kids, lending a hand. He wanted more of that feeling. Thirteen years later, he's getting a lot of it. He's on a five-month road trip across America--not sightseeing, but volunteering. The University City resident has spent time at an animal reserve in Utah, a women's shelter in St. Louis, a soup kitchen in New York, a retirement home in Tucson. This week he's in Los Angeles, at a program that supports disabled youth. "I just like helping people and feeling that something I do is making a difference," he said. He resists the idea that his "Do Good Adventure" is all that unusual. It bothers him that the media often describe young people as lazy, self-centered and materialistic. So he sees his trip as a chance to make a statement, too. "About 55 percent of teens do volunteer work, higher than the rate for adults," he said, according to a 2002 study. "Not everybody knows that." Of course, some teens do volunteer work because it looks impressive on their college applications. Lyons said he mentioned his trip on his submissions. But charity work is a habit with him. Even before the crosscountry trip, he was volunteering about 200 hours a year at various places. He's made sandwiches for homeless families in Washington D.C. He's taught math to fifth-graders in Cuernavaca, Mexico. He gets some of that drive from his mother, Leslye Lyons, who has been involved in nonprofits for much of her life. She was there when her son "read" to the preschoolers--a memory of hers "that will never go away." Question: What did Russell Lyons think of his first volunteering? Answer:
****
A: Impressive.

Problem:OPTIONS:
- It has become an effective tool in fighting HIV.
- It was first found by Permar and her research group.
- It can prevent transmission in a live animal effectively.
- It can sometimes prevent mother-to-child transmission of HIV.

Read the following article and answer the question. Article: For decades, public health officials have puzzled over a surprising fact about HIV: Only about 10-20 percent of infants who are breastfed by infected mothers catch the virus. Tests show, though, that HIV is indeed present in breast milk, so these children are exposed to the virus multiple times daily for the first several months of their lives. Now, a group of scientists and doctors from Duke University has figured out why these babies don't get infected. Human breast milk naturally contains a protein called Tenascin C that neutralizes HIV and, in most cases, prevents it from being passed from mother to child. Eventually, they say, the protein could potentially be valuable as an HIV-fighting tool for both infants and adults that are either HIV-positive or at risk of contracting the infection. The research, published in Proceedings of the National Academy of Sciences, was inspired by previous work by other researchers showing that, both in tissue cultures and live mice, breast milk from HIV-negativemothers was naturally endowed with HIV-fighting properties. Scientists suggested that a few different proteins in the milk could potentially be responsible, but no one knew which one. As part of the study, the researchers divided breast milk into smaller fractions made up of specific proteins via a number of filters -- separating the proteins by size, electrical charge and other characteristics--and tested which of these fractions, when added to a tissue culture, prevented the cells from being infected by HIV. Eventually, they found that one particular protein was present in all the HIV-resistant fractions but in none of the others: Tenascin C. Tenascin C works by blocking a key protein on HIV's envelope that normally ties up to a receptor on a T cell's membrane called CCR5. In doing so, Tenascin C prevents HIV from mixing with the T cell and injecting its RNA inside. Still, the researchers say that other natural elements in milk might play a role in fighting HIV as well. "It's clearly not the whole story,... Question: Which of the following about Tenascin C is true? Answer:
****
A:
It can sometimes prevent mother-to-child transmission of HIV.