When children start kindergarten, evident gaps in science knowledge already exist between Whites and minorities and between youngsters from upper-income and low-income families. And they often deepen into significant achievement gaps by the end of eighth grade if they are not dealt with during elementary school. The findings suggest that, in order for the United States to maintain long-term scientific and economic competitiveness in the world, policymakers need to renew efforts to ensure access(n.,) to high-quality, early learning experiences in childcare settings, preschools and elementary schools. The researchers' study tracked 7,757 children from their start in kindergarten to the end of eighth grade. Researchers found that, among kindergarteners with low levels of general knowledge, 62 percent were struggling in science by the time they reached third grade and 54 percent were struggling in that subject in eighth grade. And general knowledge gaps between minorities and Whites were already large at the time when students began kindergarten. "Children growing up in low-income families typically experience comparatively fewer early opportunities to learn about the natural and social sciences," the authors wrote. "Their parents often have lower educational levels and therefore less science knowledge themselves as well as fewer resources available to direct the children's academic growth. Children raised in poverty often attend poorly resourced schools that futher limit their academic opportunities." Morgan said that, within families, parents who regularly talk and interact with toddlers can point out and explain physical, natural and social events occurring around them daily. This might help youngsters learn facts and concepts that will prepare them to take better advantage of science instruction they receive during elementary and middle school. What can parents do to help their toddlers learn? A) Give them more nutritious food B) Offer them more learning resources. C) Let them attend science courses for kids D) Greate learning opportunities in daily life.
D
Nearly all of today's Native Americans in North, Central and South America can trace their ancestry to just six women whose descendants immigrated around 20,000 years ago, a DNA study suggests. The finding does not mean that only these six women gave rise to migrants who crossed into North America from Asia in the earliest population of the continent.Rather, it suggests that only six left a particular DNA legacy that persists to today in about 95% of Native Americans, said study co-author Ugo Perego in Utah. "The women did not necessarily arrive together, nor even all live at the same time," he said.Results indicate the women arrived sometime between 18,000 and 21,000 years ago. The work was published this week by the journal PLoS One.Perego is from the Sorenson Molecular Genealogy Foundation in Salt Lake City and the University of Pavia in Italy.The work confirms the previous indications of just six maternal lineages, as well as a date of around 20,000 years ago when the first people in North America arrived after crossing a land bridge from Asia, Perego said. The researchers studied mitochondrial DNA, which is passed only from mother to daughter.They created a "family tree" that traces the different DNA _ found in today's Native Americans.By noting mutations in each branch and applying a formula for how often such mutations arise, they calculated how old each branch was.That indicated when each branch arose in a single woman. The six "founding mothers" obviously did not live in Asia because the DNA signatures they left behind are not found there, Perego said.So they probably lived in Beringia, the now-submerged land bridge that stretched to North America, he said. Which of the following is TRUE about the research? A) It shows that DNA is passed from parents to daughters. B) It concludes that the six women arrived individually but lived at the same time. C) It is a joint one conducted by Salt Lake City and an Italian university. D) It shows that only six women in 95% of present Native Americans have got a particular DNA legacy.
C
Q: If you never read the classic F. Scott Fitzgerald's novel The Great Gatsby, now is your chance to catch up -- by watching the latest film adaptation. Because if there's one sentence to sum up the film, it would be, as Fox News says in its review, "It's just like the book" Director Baz Luhrmann's main challenge was "either to find a visual equivalent for Fitzgerald's elegant essay--the open secret of the book's staying power-- or to bend the material to his own exotic strengths,a Time magazine review says. He tries it both ways, with varying degrees of success. Considered to be Fitzgerald's representative work, The Great Gatsby explores themes of idealism, resistance to change, social change, and excess, creating a portrait of the Jazz Age or the Roaring Twenties that has been described as a cautionary tale regarding the American Dream. Nick, the narrator, moves to New York for the summer to visit his cousin Daisy. His next-door neighbor is Jay Gatsby (Leonardo DiCaprio), who rarely contacts with others and is rumored to be a hero of the Great War. Gatsby claims to have attended Oxford University, but the evidence is suspect. As Nick learns more about Gatsby, every detail about him seems questionable, except his love for the Daisy. Though Daisy is married, Gatsby still adores her as his --golden girl.They first met when she was a young lady from a wealthy family and he was a working-class military officer. Daisy promised to wait for his return from the war. However, she married Tom, a classmate of Nick's. Having obtained a great fortune, Gatsby sets out to win her back again. "All of Fitzgerald's original creation finds its way into this film, even going as far to include quite a bit of the original dialogue,US film critic Justin Taroli writes in his review. "The cast is beautiful as is the script, and the scenes are a visual feast.Taroli adds. DiCaprio does a good and professional job as the socialite by re-creating Fitzgerald's description of Gatsby's charm. "He can look at someone for an instant and... What is Taroli's attitude towards the film? A) Favorable. B) Sceptical. C) Amazed. D) Unconcerned.
A: A
Q: This year some twenty-three hundred teenagers (young people aged from 13-19) from all over the world will spend about ten months in U. S. homes. They will attend U.S. schools, meet U.S. teenagers, and form impressions of the real America. At the same time, about thirteen hundred American teenagers will go to other countries to learn new languages and gain a new understanding of the rest of the world. Here is a two-way student exchange in action. Fred, nineteen, spent last year in Germany with George's family. In turn, George's son Mike spent a year in Fred's home in America. Fred, a lively young man, knew little German when he arrived, but after two months' study, the language began to come to him. School was completely different from what he had expected-much harder. Students rose respectfully when the teacher entered the room. They took fourteen subjects instead of the six that are usual in the United States. There were almost no outside activities. Family life, too, was different. The father's word was law, and all activities were around the family rather than the individual . Fred found the food too simple at first. Also, he missed having a car. "Back home, you pick up some friends in a car and go out and have a good time. In Germany, you walk, but you soon learn to like it." At the same time, in America, Mike, a friendly German boy, was also forming his idea. "I suppose I should criticize American schools", he says. "It is far too easy by our level. But I have to say that I like it very much. In Germany we do nothing but study. Here we take part in many outside activities. I think that maybe you schools are better in training for citizens. There ought to be some middle ground between the two." After experiencing the American school life, Mike thought _ . A) German schools trained students to be better citizens B) a better education should include something good from both America and Germany C) American schools were not as good as German schools D) the easy life in the American school was more helpful to students
A: B