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
C
One of the keys to being successful is persistence .Once you have determined exactly what you want to achieve, you must take active action in order to succeed. One of the things you'll notice on your journey towards your goal are roadblocks. That is, you will come across obstacles to discourage your progress. Actually, they are a part of life. Everyone would have every success they ever wanted if there were no obstacles. Your job is to be persistent and work through those obstacles. If you find little or no obstacles along the way, chances are that you are not really challenging yourself. And when you do reach your goal, you won't experience the feeling of "sweet success". Make your goal a challenging one! If you take the time to study any successful person, you will learn that the vast majority of them have had more "failures" than they have had "successes". This is because successful people are persistent; the more they stumble and fall, the more they get right back up and get going again. On the other hand, people that don't get back up and try again, never reach success. For example, Walt Disney was turned down 302 times before he got financing for his dream of creating the "Happiest Place on Earth". Today, due to his persistence, millions of people have shared "the joy of Disney". Having known these facts, keep in mind that you must constantly reevaluate your circumstances and the approach you are using to reach your goal. There is no sense in being persistent at something that you are doing incorrectly! Sometimes you have to modify your approach along the way. Every time you do something you learn from it, and therefore find a better way to do it the next time. Today is the day to begin your journey, using consistency and persistency, towards tomorrow's successes! What must you reevaluate constantly? A) Attitudes and skills. B) Circumstances and ways. C) Roadblocks and challenges. D) Failures and successes.
B
*Question*
Do you dream of owning your own house? Canadian Kyle MacDonald, a 26-year-old from Vancouver who is a resident in Montreal, has just achieved it. MacDonald, who has spent much of his time since graduating from college backpacking round Europe and Asia and whose main income appears to come from working as a pizza-delivery man, decided last year that he wanted to settle down. However, when he checked the real estate market, he quickly realized that he had no chance of raising the depositon a home of his own. So he came up with an inventive solution. Using the power of the Internet, he decided to try to barter his way to a house. His starting offer One red paper clip . Of course, he didn't expect someone to offer him a house for the paper clip, he simply wanted to trade it for something that was more valuable. 14 trades later, he is now the owner of a house in Kipling, Saskatchewan. His first trade took place when two women from his hometown offered him a pen in the shape of a fish. MacDonald then traded the fish-pen for a doorknob, then the doorknob for a stove. Further _ brought him an electricity generator and a ski-bob, a small vehicle on tracks that people use to ride across snow and ice. After nine trades, he had a recording contract at a music studio in Toronto. But Kyle pressed on, still convinced that he would eventually get a house. After trades which brought him the opportunity to spend a day with rock star Alice Cooper and to have a small part in a Hollywood movie, he struck gold. When words of Kyle's astonishing barter journey reached the people of Kipling, they decided to make their move. The population of the town is a little more than l,000, and falling fast. By offering the keys to an empty house on Main Street, Kipling hoped to bring much needed publicity--and residents--to the fading town. And they seem to have succeeded! When Kyle MacDonald started his Internet bartering, he _ . A) hoped that someone would give him a house for his paper clip B) didn't expect anyone to give him a house for a paper clip C) didn't know if anyone would exchange a house for a paper clip D) expected that he would have a house after 14 trades
**Answer**
B