Question: Scientists study the ocean in many different ways. Although many marine scientists focus on animals in the ocean, others seek to gain a better understanding of the ocean's chemical and physical components . Scientists are learning a great deal about the natural and human-caused processes that shape the ocean and its many life forms. Much of the present research focuses on how human activity influences the ocean. Clean water is a limited resource, and ocean pollution does harm to plant and animal health. Some scientists are now studying ocean water to find out just how contaminated it is. Scientists are also working on new methods to estimate the presence of poisons in the ocean, which will help them develop better techniques for cleaning up the water. Others look at how sea living things get used to poisons because poisonous sea life has an effect on humans too. For example, some seafood is poisoned, which may cause a threat to humans who eat it. Another type of marine scientist tries to learn more about the history of the ocean. Understanding the ocean's past tells scientists more about its patterns and cycles today and in the future. The ocean's past, which is recorded by deposits in the ocean floor, helps scientists understand such important matters as global climate change and other environmental differences. The more researchers learn about the history of the ocean and its relation to climatic and environmental changes, the more likely that they will one day understand what causes such changes. Other scientists are concerned with understanding how ocean systems work. The word systems refers to all the conditions and elements that are continually changing the ocean. Understanding these systems is necessary to protect the ocean and ensure the safety of its life forms. The cycles of ocean life also have an enormous effect on human life; for example, studying coastal waters is important because they provide much of the fish that humans eat. Marine geologists are earth scientists who work along the ocean... We know from the passage that ocean waters are important to human life because they _ . A) mirror the history of the mighty ocean B) show climatic and environmental changes C) are source of the fish people consume D) are the evidence of the changes of the ocean
Answer: C

Question: Perhaps you have seen them on the playground, at preschool drop-off or piano lessons, or even in TV shows like Up All Night. They are the stay-at-home dads, and lately, it seems they're everywhere. The latest research shows that 32 percent of dads regularly care for their children, and among those with preschool-age kids, one in five dads is the primary caregiver. In families where mom works, that figure rises to nearly one in three. Stay-at-home dads have become so common that even toy makers like Mattel are catering to them. A recent study finds that today's full-time fathers aren't trying to be "Mr. Moms". Instead, they're carving out their own unique roles as parents. I spoke with some experienced stay-at-home dads, who agreed that their parenting styles are different. "I do let the kids take more risks on the playground, while my wife tends to get nervous that they'll fall and hurt themselves," says Kyle, 38, an artist. Besides, as there are more and more stay-at-home dads, they are turning to each other for support. They have created Meet Up groups and held Dads Nights Out. Kyle admits he had noticed a change recently. "Several years ago, I was checking out at a store with the kids, and the cashier was very curious why I was buying food instead of my wife. I told her that I was a full-time dad, and she commented, 'Wow, I have never met one of you before.' Now, my next-door neighbor is a dad who works from home and we often trades off watching the kids after school. " As for my own husband, although he admits that being a full-time dad is encouraging, he's also proud of the strong bond with our daughter, which will offer her benefits that last for years. Children wit caring dads tend to have higher intelligence and more confidence, and do better in school. They also are less likely to experience depression or get into trouble, and have better social skills. What change has Kyle noticed recently? A) The founding of Meet Up groups. B) The change of people's attitude towards them. C) The increase in the number of stay-at-home dads. D) The development of new communication methods.
Answer: C

Question: The Man behind Blue Jeans Levi Strauss was born in 1829 in Bavaria,Germany. He was the fifth of six children. His father sold dry goods from door to door. (Dry goods include many different things; fabric , thread,scissors,combs,buttons,yarn,etc.) In 1845, his father died. All six children decided to go to the United States. Two of Strauss' bothers started a dry goods company in New York City. Strauss' sister Fanny and her husband started a similar business in San Francisco. Strauss decided to go to the southeastern part of the United States. For eight years, he walked along the country roads selling dry goods from door to door - just like his father in Bavaria. In 1853, Strauss decided to move to San Francisco.(At that time, thousands of people traveled to California to look for gold.)On the way to California, Strauss sold almost all of his dry goods. He had only one thing left-- some _ . In California, Strauss tried to sell the canvas to the gold miners . He said they could make tents from the canvas. But they weren't interested in canvas for tents. Strauss didn't know what to do with the canvas. Then, he had an idea. Strauss could see that the miners needed new pants. There were holes in their pants because the fabric wasn't strong. He decided to make the canvas into pants. They called them " _ ". Later, Strauss stopped using canvas and used a different fabric. It was a heavy cotton fabric-- the same kind people wear today. Levi Strauss died in 1902. He never married and left his money to his nephews. He left the world much more -- the jeans that so many people wear. _ isn't a kind of dry goods. A) Thread B) Gold C) Comb D) Yarn
Answer:
B