I'm taking a test and have to guess the right answer to the question after the article. Article: American researchers say drinking tea may help strengthen the body's defense system against infection. Doctors at Brigham and Women's Hospital in Boston, Massachusetts, did the study. The team studied a chemical found in black, green, oolong and pekoe tea. This chemical is an amino acid called L-theanine. The scientists say it may increase the strength of gamma delta T cells. That's the letter T, not the drink. Gamma delta T cells are part of the body's defense. First, the researchers mixed some of these cells with antigens found in the amino acid . Antigens help the body react to infection. Then the scientists added some bacteria. Within twenty-four hours, the cells produced a lot of interferon, a substance that fights infection. Cells not mixed with the antigens did not produce interferon. In the second part of the study, eleven people drank five to six cups of black tea every day. Ten other people drank the same amount of instant coffee. That is dried coffee mixed with hot water. Two weeks later, and again two weeks after that, the researchers tested the blood of all twenty-one people. They also looked at what happened when they added bacteria to the blood cells. They found that the tea drinkers produced five times more interferon after they started drinking tea. The coffee drinkers did not produce interferon. Doctor Jack Bukowski led the study. He says the antigens added to the gamma delta T cells were responsible for the increased reaction to the bacteria. He says that the study also showed that the cells were able to remember the bacteria and fight them again the next time. Earlier research already has found that tea can help prevent heart disease and cancer. Doctor Bukowski says the new study must be repeated by more people. "If the findings prove to be true," he says, "then tea drinking might also help protect against bacterial infections." He says the amino acid L-theanine could be removed from the tea and used as a drug to strengthen the body's defenses. Question: We may know from the text that _ can be found in different kinds of tea. Options: A: L-theanine B: Gamma delta T cells C: interferon D: bacteria
A

I'm taking a test and have to guess the right answer to the question after the article. Article: You've probably grown accustomed to texting in the glow of a mobile phone screen. Well, there's some good and bad news coming for those of you who spend hours speedily tapping messages to one another. The good news is that the hours you spend face-to-phone are paying off. You may have become fluent in a second language. The bad news, however, is that this language is texting. Worse still, there isn't yet a texting section in your school exams, so you'll need to work harder to recover the grammar skills you might be killing with every LOL and BRB (Be right back). A new study confirms what many parents suspect. The more kids send and receive texts, the poorer their grammar skills become. With "the culture of mobile communication--quick back and forth , there are compromises on traditional, cultural writing", said S. Shyam Sundar, professor of Pennsylvania State University, which conducted the study. "Techspeak", as Sundar and his research partner Drew P. Cingel call it, has become so prevalent among young users that it's changing their foundation of basic grammar. "Routine use of textual adaptations by current and future generations of 13-to-17-year-olds may serve to create the impression that this is normal and accepted use of the language, "they said in their published findings. It seems teenagers are unable to "code switch-shift" between standard grammar and the abbreviations used in text messages, Sundar said. These abbreviations have become the real words for them now. However, linguists aren't particularly disturbed by the trend, Sundar added. "The linguists will tell you the language is very dynamic. " Still, students have exams to worry about. Here's a sample of the questions, so you can test yourself to see how texting has affected your grammar: *During the flood, we (dranked, drank, drunk, drunked) bottled water. *Fortunately, Jim's name was (accepted, excepted) from the list of those who would have to clean bathrooms because he was supposed to go downtown to (accept, except) a... Question: With the sample of the questions at the end of the article, the author intends to _ . Options: A: get teens to attach more importance to grammar exams B: give some useful tips on how to pass a grammar exam C: get teens to find out how much texting has affected their use of language D: prove that teens' routine of texting is changing their understanding of basic grammar
C

I'm taking a test and have to guess the right answer to the question after the article. Article: Pingyao, in the center of Shanxi Province, is a famous historic cultural city of China and a world cultural heritage site . It's 90 kilometers south of Taiyuan on the Fen River. People lived in Pingyao during the New Stone Age. Its long period as a country government seat has left Pingyao with lots of historic buildings and sites, with a 2,700-year history. Ninety-nine of _ are under government protection, including Zhengguo Temple, Shuanglin Temple and Pingyao Ancient City. During the Ming and Qing Dynasties, businessmen organized commercial groups that did business nationwide. Shanxi Province had some of the most important ones and Pingyao was their center. In 1823, a store, known as Rishengchang(Sunrise Prosperity), traded in bank checks rather than in silver or gold coins. It was the beginning of modern Chinese banking. Branch banks were soon set up in major cities in China and other parts of Asia, leading to great development in Pingyao. Its Lacquer ware became well known. In Pingyao Ancient City are many traditional houses and commercial buildings, 3,797 of which are protected and more than 400 of which are in good condition. Not only do the houses in Pingyao show Shanxi's history and culture, but this large number is valuable for studying its history, customs, and ancient buildings and art. Most of these houses are still used as homes and shops of local people. In 1997, Ancient Pingyao City was listed in World Heritage List as " World Culture Heritage Site". Question: During the Ming and Qing dynasties, Pingyao was a leading center in _ . Options: A: agriculture B: raising cattle C: commercial trade D: making gold coins
C