托福习题练习
| 托福考试易错题（2019/2/19） |
| 第1题： {$mediaurl} Which of the following ideas are mentioned in the passage as elements of the theory of plate tectonicsClick on 2 answers. A、Boundaries where two pieces of theEarth’s outer shell diverge. B、Zones where one tectonic plate moves under another. C、The expansion of oceans and other bodies of water. D、The existence of a land bridge that connected continents. |
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| 第2题：学生找老师说要reproduce一个书上的实验，检验moth翅膀上的eyespot是不是真的能吓走birds。然后老师说eyespot的作用其实只是assumption, 学生失望地说，不是base on research啊(有题)。然后学生描述书里的实验结果，说圆的eyespot对于birds并不更有威吓力，老师问：是less effective吗？学生说：就是the same。然后老师说，有个问题是你要在哪里做实验呢？我们campus里面不好做。学生说她放假回家做，她家在郊区有moth, 可以在自家backyard里做。然后老师建议了些方法，提到了一种ant(有题)。 |
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| 第3题： {{B}}Reading SectionDirections{{/B}} In this section you will read five passages and answer reading comprehension questions about each passage. Most questions are worth one point, but the last question in each set is worth more than one point. The directions indicate how many points you may receive. You will have 60 minutes to read all of the passages and answer the questions. Some passages include a word or phrase that is underlined in blue.Click on the word or phrase to see a definition or an explanation. When you want to move on to the next question, click on {{B}}Next{{/B}}. You can skip questions and go back to them later as long as there is time remaining. If you want to return to previous questions, click on {{B}}Back{{/B}}. You can click on {{B}}Review{{/B}} at any time and the review screen will show you which question you have answered and which you have not. From this review screen, you may go directly to any question you have already seen in the reading section. When you are ready to continue, click on the {{B}}Continue{{/B}} icon. {{B}}Set 1{{/B}} It looks as if it came straight from the set of Star Wars. It has four-wheel drive and rises above rocky surfaces. It lowers and raises its nose when going up and down hills.And when it comes to a river, it turns amphibious: two hydrojets power it along by blasting water under its body. There is room for two passengers and a driver, who sit inside a glass bubble operating electronic, aircraft-type controls.A、vehicle so daring on land and water needs windscreen wipers — but it doesn’t have any. Water molecules are disintegrated on the screen’s surface by ultrasonic sensors. This unusual vehicle is the Racoon. It is an invention not of Hollywood but of Renault, a rather conservative French state-owned carmaker, better known for its family hatchbacks. Renault built the Racoon to explore new freedoms for designers and engineers created by advances in materials and manufacturing processes. Renault is thinking about startlingly different cars; other producers have radical new ideas for trains, boats and aeroplanes. The first of the new freedoms is in design. Powerful computer-aided designCAD、systems can replace with a click of a computer mouse hours of laborious work done on thousands of drawing boards. So new products, no matter how complicated, can be developed much faster. For the first time,Boeing will not have to build a giant replica of its new airliner, the 777, to make sure all the bits fit together. ItsCAD、system will take care of that. But Renault is takingCAD、further. It claims the Racoon is the world’s first vehicle to be designed within the digitised world of virtual reality.Complex programs were used to simulate the vehicle and the terrain that it was expected to cross. This allowed a team led by Patrick Le Quement, Renault’s industrial-design director, to "drive" it long before a prototype existeD、 Renault is not alone in thinking that virtual reality will transform automotive design. InDetroit, Ford is also investigating its potential. Jack Telnac, the firm’s head of design, would like designers in different parts of the world to work more closely together, linked by computers. They would do more than style cars. Virtual reality will allow engineers to peer inside the working part of a vehicle.Designers will watch bearings move, oil flow, gears mesh and hydraulics pump.As these techniques catch on, even stranger vehicles are likely to come along. Transforming these creations from virtual reality to actual reality will also become easier, especially with advances in materials. Firms that once bashed everything out of steel now find that new alloys 【单选题】： | |
| 第4题：When ______ from milk, the remainder is called skim milk. A、all the butterfat is removed B．removing all the butterfat that C．is all the butterfat removed D．the removal of all the butterfat |
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| 第5题： Energy from Natural Gas 1. Much of the world gets its energy from fossil fuel sources, including coal, oil, and natural gas, all of which were created millions of years ago.The process began with dead plant and animal matter that collected and over time was buried deep within the earth. There, exposed to extreme pressure and temperatures, the carbon-based material underwent various chemical and physical changes. Some of it became coal, some oil, and some natural gas, depending on the exact conditions it was subjected to. 2. Natural gas is both invisible and odorless.During the first century of the fossil fuel era, it was disregarded as a worthless byproduct of coal and oil. However, people later discovered that it could also be a useful source of energy, and they set about trying to realize its potential. Its use began to grow in the twentieth century and has increased rapidly within the last 40 years. Nowadays, natural gas is employed all over the world to heat homes, generate electricity, power factories, and even fuel vehicles. 3.Because it was created through the same process as other fossil fuels, natural gas can often be retrieved from oil fields, something known as an associated source.Coal beds have similarly been known to yield natural gas. In addition, there are isolated deposits containing only gas that are referred to as non-associated sources. To access a subterranean natural gas pocket, a hole is drilled down into it, just as in oil extraction. However, due to the gas’s lightness, it will rise to the surface on its own instead of having to be pumped out. 4. The compound we know as natural gas is actually a composite of several different substances, the primary one being methane gas.Each deposit has a unique makeup, but other common components of natural gas include propane, butane, and sulfur.Borrowing terms used in the description of oil, natural gas with a high sulfur content is called "sour" while that with a low content is referred to as "sweet" Regardless of the exact composition, natural gas must be refined to remove its impurities; when ready for use, it is nearly pure methane. 5. Natural gas offers many advantages as a fuel source, the first and most important being that it is extremely clean burning. While oil and coal both have complex molecular structures, methane’s is simple: one carbon atom surrounded by four atoms of hydrogen. The lack of excess particles translates into fewer waste byproducts during combustion. For example, all fossil fuels produce carbon dioxide when burned, but natural gas releases substantially less carbon dioxide than other fuels. Given the major role of carbon dioxide in the acceleration of global warming, this is an important attribute. In addition, natural gas emits far less nitrogen and sulfur, which are key contributors to the smog that pollutes the air in metropolitan areas, as well as acid rain. 6. The benefits of natural gas extend far beyond its cleanliness. Since it contains fewer waste particles, its energy can be acquired with much more efficiency than that of the other fossil fuels, meaning a lower overall cost for the consumer.  Finally, natural gas is relatively plentiful and widespreaD、 Geologists have identified extensive stores inCanada, the United States, Russia, the MiddleEast, andAustralia, among other locations. 7. Of |
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