Jim was a farmer. He lived in a village far away from the town. One day he was very ill , and everyone thought he would die . But his family wouldn't give up. They decided to sent for a doctor in town . The doctor arrived the village two days later and looked over the man. The doctor wanted a pen and some paper , But there was no pen or paper in the village , because nobody could read or write . The doctor looked around and picked up a piece of burnt wood. Using the wood, he wrote the name of the medicine on the door of the house." Get the medicine for him right away, " he said, "and he will soon get well.' family and friends did not know what to do . They could not read the writing . Then the village baker had an idea . He took off the door of the house and took the door to the nearest town . He bought the medicine, and Jim was saved. After that Jim would not let anyone wash the magic words off the door . When the doctor got to the village, he _ . A) found another doctor there B) gave some medicine to Jim C) looked over Jim carefully D) had no idea and could do nothing for Jim
C
(Question)
George Gershwin was born in New York City in 1898. His parents were Russian Jews who had immigrated to the United States. George and his two brothers and sister had a close, happy family life. George liked playing games on the streets of New York. He liked exploring the city. He did not like school or studying. While exploring the city, George heard jazz and blues music in and out of public drinking places. However, he did not become seriously interested in music until he heard another boy playing the violin in a concert at his school. George began to take piano lessons. His teacher was a fine classical musician. He immediately recognized George's unusual ability. The teacher wrote about him to a friend: "I have a student who will make his mark in music, if anybody will. The boy is a genius, without doubt. " George studied classical piano. But his strongest interest continued to be jazz and popular music. At the age of fifteen, he left school and went to work in the music business. At that time, the New York City street where most music publishers had their offices was called "Tin Pan Alley." The piano players played the songs all day long to interested singers and other performers. George Gershwin was one of the youngest piano players in Tin Pan Alley. Soon, he was considered one of the finest there. He was already writing his own songs. He succeeded in getting one published when he was only eighteen years old. George Gershwin was now a real composer. The rest of his life was an unbroken record of success. He wrote song after song. His ideas were so endless that he was not even troubled when he once lost some music he had been writing. "There is plenty more where that came from," he said. George Gershwin had his first big hit in 1919, when he was twenty-one years old. It was a song called "Swanee." A popular entertainer, Al Jolson, sang the song. "Swanee" was made into one of the first musical recordings. George Gershwin was suddenly famous. We know from the passage that _ . A) George Gershwin was born in Russia. B) George Gershwin's parents had 5 children. C) His teacher believed in his musical gift. D) Classical piano was his favorite music.
(Answer)
C
Ques: New experiments discover rats showing sympathy and helping other rodents .It is a characteristic some scientists thought was reserved only for humans and higher animals. In repeated tests, rats freed another trapped rat in their cage, even when yummy chocolate served as an attraction.24 of the 30 rats opened the trap by pushing in a door.The rats could have eaten the chocolate before freeing their partners, but often didn't, choosing to help and share the goodies. "Basically they told us freeing another rat is as important as eating chocolate," said study author Peggy Mason of the University of Chicago."That's a very striking thing." In some cases, the rats first took the chocolate chips out of a container, but didn't eat them, then freed the other rat and shared "almost as if they were serving them chocolate," Mason said.The research is reported in Thursday's journal Science. Also, females showed more consistent care and help than males, Mason said.All six females freed their trapped partner while three quarters of the 24 males did so.This confirms other studies that show females showing more pro-social behavior than males.There were time when the male rats took the day off from helping their trapped partner, but the females never did, she said. Jeff Mogil at McGill University in Canada, who wasn't part of the study, said it was a little surprising but even more convincing. Both scientists said social understanding is probably a characteristic that is important in the evolution of animals. Mason joked that if rats can be so caring and helpful, "there's a sense of optimism.It's something we could be." What's the difference between the behavior of male and female rats? A) Female rats showed more concern about their trapped partners. B) Male rats cared more about their trapped partners than females. C) Female rats behaved less pro-socially than male rats on the whole. D) Male rats didn't go away from their trapped partners for even a day.
Ans: A
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,... Which of the following about Tenascin C is true? A) It has become an effective tool in fighting HIV. B) It was first found by Permar and her research group. C) It can prevent transmission in a live animal effectively. D) It can sometimes prevent mother-to-child transmission of HIV.
D