I'm taking a test and have to guess the right answer to the question after the article. Article: Electronic books have changed the way many people read for pleasure. Now online textbooks are changing the way some students learn and some teachers teach. More than one hundred seventy-five thousand students attend the public schools in Fairfax County, Virginia, outside Washington. Last year, the school system used digital books in fifteen schools. This school year, middle schools and high schools changed from printed to electronic textbooks in their social studies classes. Luke Rosa is a history teacher at Falls Church High School. His students work on laptop computers at school. He explains the idea to them this way. "I mean, it's just like a regular textbook, except it's got it all online." Peter Noonan, an assistant superintendent of schools, said, "The world's changing. And the online textbooks can change right along with the events that are happening." Digital books also cost less than printed textbooks, he said. A student named Melanie Reuter said, "I don't have to carry a textbook around, so that's nice." But another student said, "I don't like it because the Internet sometimes doesn't work." Students also need access to the Internet when they are not at school. About ten percent of students in Fairfax Country do not have a computer or online access at home. Public libraries in the country have free Internet. There are also after-school computer labs as well as computer clubhouse supported by the country. Middle school student Slieman Hakim is happy about that. He said, "My family only has one computer; my sister and I both do our homework on it. So I come here to do my homework. It's good." Other school systems in the area are also considering online textbooks. Question: Which of the following is /are NOT used when students have social studies classes? Options: A: Paper textbooks. B: The Internet. C: Computers. D: Electronic textbooks.
A

I'm taking a test and have to guess the right answer to the question after the article. Article: When people first walked across the Bering Land Bridge thousands of years ago, dogs were by their sides, according to a study published in the journal Science. Robert Wayne of the University of California, Los Angeles, and Jennifer Leonard of the Smithsonian Institute, used DNA material--some of it unearthed by miners in Alaska--to conclude that today's domestic dog originated in Asia and accompanied the first humans to the New World about 10,000 to 15,000 years ago. Wayne suggests that man's best friend may have enabled the tough journey from Asia into North America. "Dogs may have been the reason people made it across the land bridge," said Wayne. "They can pull things, carry things, defend you from fierce animals, and they're useful to eat." Researchers have agreed that today's dog is the result of the domestication of wolves thousands of years ago. Before this recent study, a common thought about the precise origin of North America's domestic dog was that Natives domesticated local wolves, the descendents of which now live with people in Alaska, Canada, and the Lower 48. Dog _ from a Fairbanks-area gold mine helped the scientists reach their conclusion. Leonard, an evolutionary biologist, collected DNA from 11 bones of ancient dogs that were locked in permafrost until Fairbanks miners uncovered them in the 1920s. The miners donated the preserved bones to the American Museum of Natural History in New York City, where they remained untouched for more than 70 years. After borrowing the bones from the museum, Leonard and her colleagues used radiocarbon techniques to find the age of the Alaska dogs. They found the dogs all lived between the years of 1450 and 1675 A.D., before Vitus Bering and Aleksey Chirikov who were the first known Europeans to view Alaska in 1741. The bones of dogs that wandered the Fairbanks area centuries ago should therefore be the remains of "pure native American dogs," Leonard said. The DNA of the Fairbanks dogs would also expose whether they were the descendents of wolves from... Question: What does the passage mainly talk about _ . Options: A: the origin of the North American dogs B: the DNA study of ancient dogs in America C: the reasons why early people entered America D: the difference between Asian and American dogs
A

I'm taking a test and have to guess the right answer to the question after the article. Article: More than half of the parents in the United States are helping, or have helped, support their adult children who have been hit by high unemployment and poor wages , according to a new survey. It showed that present economic conditions are discouraging young adults from leaving home and forcing those who have already gone, so-called boomerang kids, to return. "Parents are continuing their financial involvement longer than we expected," said Ted Beck, president of National Endowment for Financial Education (NEFE). About 60 percent of parents questioned in the survey said they're helping their adult children who are no longer in school financially. Half are providing housing and nearly half are helping with living expenses. For an increasing number of adult children, the situation is bad. Two-thirds of adult children, aged 18 to 39, who are not in school said they faced tougher financial pressures than previous generations, according to the survey. And nearly one-third of parents agreed that it was easier for them to find their financial feet than for their children. Parents are helping their children out of genuine concern because they do not want to see them struggle. But Beck said that parents who make sacrifices to help their adult children should be careful about their own finances. "If you are taking on extra debt or delaying retirement to help your adult child, you could be making a mistake and putting your own financial future in danger," Beck warned. Boomerang children can also cause other problems for their parents. Thirty percent of parents said they had given up privacy since their adult children moved back home, while more than a quarter have taken on added debt, and seven percent have delayed retirement. But the survey also showed 42 percent of adult children living at home are helping with the cooking and cleaning. Question: According to the text, boomerang kids refer to _ . Options: A: married adult children B: grown-ups living with parents C: adult children independent and successful in life D: young adults depending on parents for financial support
D