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?????aá?°??ú′ó?ò??D§±???íD?￡￡??a′ó?ò′?à′íD?￡TPO26×?o?D′×÷???á?-??+ìyá|?-??+?ú·?·???￡??￡í???′ó?ò±???óD?ù°??ú?￡

????íD?￡TPO26×?o?D′×÷???á?-????±?￡o

????The zebra mussel, a freshwater shellfish native to Eastern Europe, has long been spreading out from its original habitats and has now reached parts of North America. There are reasons to believe that this invasion cannot be stopped and that it poses a serious threat to freshwater fish populations in all of North America. First, the history of the zebra mussel's spread suggests that the invasion might be unstoppable. It is a prime example of an invasion made possible by human transportation. From the zebra mussel￡?s original habitats in Eastern Europe, ships helped spread it out along new canals built to connect Europe?ˉs waterways. The mussel can attach itself to a ship?ˉ s bottom or can survive in the water?acalled "ballast water"?athat the ship needs to take on to properly balance its cargo. By the early nineteenth century, the mussel had spread to the whole of Europe. It was later carried to the east coast of North America in the ballast water of ships traveling from Europe. The way ships have spread the zebra mussel inthe past strongly suggests that the species will soon colonize all of North America. Moreover, once zebra mussels are carried to a new habitat, theycan dominate it. They are a hardy species that does well under a variety of conditions, and they have a high rate of reproduction. Most important, however, zebra mussels often have no predators in their new habitats, and species without natural predators are likely to dominate their habitats. Finally, zebra mussels are likely to cause a decline in the overall fish population in habitats where they become dominant. The mussels are plankton eaters, which means that they compete for food with many freshwater fish species.

????íD?￡TPO26×?o?D′×÷ìyá|?-????±?￡o

????ProfessorContrary to what you just read, there are ways to control the zebra mussel's spread. What's more, it is not so clear that the mussel is a serious threat to fish populations.True, the spread of zebra mussels couldn't be controlled in the past, but that's because people didn't have enough knowledge. In fact, there are effective ways to stop ships from carrying the mussels to new locations. Here's an example. The way zebra mussels usually travel across the ocean is that a ship takes on some fresh ?°ballast water?± in Europe and the n empties that water into American waterways when it arrives. Full of zebra mussels, but the ship can be required to empty out the freshwater and refill with ocean water while still out in the ocean. Salt water will kill the mussels.Second, it's true that zebra mussels often don't have predators in their new habitats, but that's only in the beginning. What's been happening in Europe is that local aquatic birds sooner or later notice there's a new food source around and change their habits to exploit it. They switch from whatever they were eating before to eating zebra mussels. And birds can eat a lot of mussels. So zebra mussels aren't so likely to dominate their new habitats after all.Finally,

even in habitats where zebra mussels become dominant, is the overall fish population likely to decrease. It's true that zebra mussels may have a negative impact on fish that eat plankton. But on other fish, they can have a positive impact. For example, the mussels generate nutrients that are eaten by fish that feed near the bottom of the lake or river. So bottom-feeding fish populations may increase, even if plankton-eating fish population decrease.

????íD?￡TPO26×?o?D′×÷?ú·?·???1￡o

????Contrary to what is argued in the passage, the lecture illustrates how zebra mussels are not likely to become a serious threat to freshwater fish populations in North America. First and foremost, new knowledge of the zebra mussel has shed light on new ways to prevent their invasion, even though people in the past have not been able to stop the spread of zebra mussels effectively. For instance, although a large amount of zebra mussels spread to North America by staying in the ballast water of a ship, people can now get rid of them before the ship gets to the shore ¨C if the ballast water is emptied halfway of the journey and refreshed with sea water, the zebra mussels can be exterminated as soon as they get exposed to salt water. Furthermore, zebra mussels are not likely to dominate a new habitat for a long period of time. The lecture agrees that zebra mussels may have no predators and reproduce rapidly in the beginning, but it would not be long before predators notice this new source of food and therefore prevent its domination. Finally, zebra mussels would not cause the decline of overall fish population. While zebra mussels would most likely cause the decline of plankton eaters, as the passage suggests, they would also provide nutrients for bottom-feeding fish and eventually cause the population of those fish to increase.

????íD?￡TPO26×?o?D′×÷?ú·?·???2￡o

????The reading passage states that the invasion of zebra mussels poses a serious threat to freshwater fish populations in all of North America. Contrary to what is argued in the passage, the lecture contends that there are ways to control zebra mussels and they might not bring great threats to fish population. Firstly, even though the spread of zebra mussels could not be controlled, new knowledge of zebra mussel has shed light on new ways to prevent their invasion. For instance, in the past a large amount of zebra mussels spread to North America by staying in the ballast water of a ship. But now the ship can be required to empty out the freshwater and refill with ocean water while still out in the ocean. If the ballast water is emptied halfway of the journey and refreshed with sea water, the zebra mussels can be exterminated as soon as they get exposed to salt water. Furthermore, zebra mussels are not likely to dominate a new habitat for a long period of time. The lecture agrees that zebra mussels may have no predators and reproduce rapidly in the beginning, but it would not be long before predators, like local aquatic birds in Europe, notice this new source of food and therefore prevent its domination. Finally, zebra mussels would

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新托福满分作文范文(30篇).pdf

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为了帮助大家高效备考托福，为大家带来托福TPO44综合写作阅读原文+听力原文+满分范文，希望对大家备考有所帮助。 托福TPO44综合写作阅读原文文本： In 1957 a European silver coin dating to the eleventh century was discovered at a Native American archaeological site in the state of Maine in the United States. Many people believed the coin had been originally brought to North America by European explorers known as the Norse, who traveled across the Atlantic Ocean and came into contact with Native Americans almost a thousand years ago. However, some archaeologists believe that the coin is not a genuine piece of historical evidence but a historical fake; they think that the coin was placed at the site recently by someone who wanted to mislead the public. There are three main reasons why some archaeologists believe that the coin is not genuine historical evidence. Great Distance from Norse Settlements First, the Native American site in Maine where the coin was discovered is located very far from other sites documenting a Norse presence in North America. Remains of Norse settlements have been discovered in far eastern Canada. The distance between the Maine site and the Norse settlements in Canada is more than a thousand kilometers, suggesting the coin has no real connection with the settlements. No Other Coins Found A second problem is that no other coins have been found at the Canadian sites that were inhabited by the Norse. This suggests that the Norse did not bring any silver coins with them to their North American settlements. Third, the Norse who traveled to North America would have understood that silver coins would most likely be useless to them. Silver coins may have been in wide use in Europe at the time, but the Norse, as experienced explorers, would have known that native North Americans did not recognize silver coins as money. 托福TPO44综合写作听力原文文本： Professor: Actually many archaeologists believe that the coin discussed in the reading is not a fake. They believe it represents genuine evidence that the Norse came into contact with Native Americans a thousand years ago. First, the great distance of the Maine site from the Norse settlements in Canada. Well, many other objects found at that same Native American site had come from faraway places. Not just the coin. There's a perfectly reasonable historical explanation for these objects. The Native Americans who lived at the Maine site traveled great distances within North America. They were interested in obtaining objects from faraway places. The Native Americans could have reached the Norse settlements during their travels and brought the silver coin back to Maine. Second, does the fact that we found no other coins at Norse settlements mean that the Norse didn't bring any coins with them? Not necessarily. The Norse didn't create permanent settlements in North America. At some point, they went back to Europe. When

托福写作满分范例

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托福TPO12综合写作阅读原文+听力原文+满分范文

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老托福93篇听力原文

1 Community service is an important component of education here at our university. We encourage all students to volunteer for at least one community activity before they graduate. A new community program called "One On One" helps elementary students who've fallen behind. Y ou education majors might be especially interested in it because it offers the opportunity to do some teaching—that is, tutoring in math and English. Y ou'd have to volunteer two hours a week for one semester. Y ou can choose to help a child with math, English, or both. Half-hour lessons are fine, so you could do a half hour of each subject two days a week. Professor Dodge will act as a mentor to the tutors---he'll be available to help you with lesson plans or to offer suggestions for activities. He has office hours every Tuesday and Thursday afternoon. Y ou can sign up for the program with him and begin the tutoring next week. I'm sure you'll enjoy this community service and you'll gain valuable experience at the same time. It looks good on your resume, too, showing that you've had experience with children and that you care about your community. If you'd like to sign up, or if you have any questions, stop by Professor Dodge's office this week. 2 I hope you've all finished reading the assigned chapter on insurance so

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