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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 31 to 35.  A Plastic Ocean is a film to make you think. Think, and then act. We need to take action on our dependence on plastic. We've been producing plastic in huge quantities since the 1940s. Drink bottles, shopping bags, toiletries and even clothes are made with plastic. We live in a world full of plastic, and only a small proportion is recycled. What happens to all the rest? This is the question the film A Plastic Ocean answers. It is a documentary that looks at the impact that plastic waste has on the environment. Spoiler alert: the impact is devastating.  The film begins as a journey to film the largest animal on the planet, the blue whale. But during the journey the filmmakers (journalist Craig Leeson and environmental activist Tanya Streeter) make the shocking discovery of a huge, thick layer of plastic floating in the middle of the Indian Ocean. This prompts them to travel around the world to look at other areas that have been affected. In total, they visited 20 locations around the world during the four years it took them to make the film. The documentary premiered in 2016, and is now on streaming services such as Netflix.  It's very clear that a lot of research went into the film. There are beautiful shots of the seas and marine life. These are contrasted with scenes of polluted cities and dumps full of plastic rubbish. We see how marine species are being killed by all the plastic we are dumping in the ocean. The message about our use of plastic is painfully obvious.  But the film doesn't only present the negative side. In the second half, the filmmakers look at what we can do to reverse the tide of plastic flowing around the world. They present short-term and long-term solutions. These include avoiding plastic containers and ‘single-use’ plastic products as much as possible. Reuse your plastic bags and recycle as much as you can. The filmmakers also stress the need for governments to work more on recycling programmes, and look at how technology is developing that can convert plastic into fuel.  We make a staggering amount of plastic. In terms of plastic bags alone, we use five hundred billion worldwide annually. Over 300 million tons of plastic are produced every year, and at least 8 million of those are dumped into the oceans. The results are disastrous, but it isn't too late to change. Once you've seen A Plastic Ocean, you'll realise the time is now and we all have a role to play. (Source: https://learnenglish.britishcouncil.org) What is the main idea of the passage?

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Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question. Three scales of temperature, each of which permits a precise measurement, are in current use: the Fahrenheit, Celsius, and Kelvin scales. These three different temperature scales were each developed by different people and have come to be used in different situations. The scale that is most widely used by the general public in the United States is the Fahrenheit scale. In 1714, Daniel Gabriel Fahrenheit, a German physicist who was living in Holland and operating an instrument business, developed a thermometer and the temperature scale that still carries his name. His original scale had two fixed points: 0º was the lowest temperature and 96º was what he believed was the normal temperature of the human body. Based on this scale, he calculated that the freezing point of water was 32º; in later studies, it was determined that the boiling point of water was 212º. The Fahrenheit scale came to be accepted as the standard measure of temperature in a number of countries. Today, however, the United States is the only major country in the world that still uses the Fahrenheit scale. The scale that is in use in many other countries is the Celsius scale. Anders Celsius, a Swedish astronomer, developed a thermometer in 1741 that based temperatures on the freezing and boiling temperatures of water. On the thermometer that Celsius developed, however, 0º was used to indicate the boiling temperature of water, and 100º was used to indicate the freezing temperature of water. After his death, the scale was reversed by a friend, the biologist Carl von Linne. On the new scale after the reversal by von Linne, 0º indicated the freezing temperature of water, and 100º indicated the boiling temperature of water. At around the same time, a similar thermometer was being developed in France. After the French Revolution, the scale developed in France was adopted as part of the metric system in that country under the name centigrade, which means "a hundred units," and from there it spread worldwide. In 1948, an international agreement was made to rename the centigrade scale the Celsius scale in honor of the scientist who was first known to use a 100-degree scale, though it should be remembered that the scale that Celsius actually used himself was the reverse of today's scale. A third scale, the Kelvin scale, is generally used today for scientific purposes. This scale was first suggested in 1854 by two English physicists: William Thomson, Lord Kelvin and James Prescott Joule. The Kelvin scale defines 0º as absolute zero, the temperature at which all atomic and molecular motion theoretically stops, and 100º separates the freezing point and boiling point of water, just as it does on the Celsius scale. On the Kelvin scale, with 0º equal to absolute zero, water freezes at 273º, and water boils at a temperature 100º higher. The Kelvin scale is well suited to some areas of scientific study because it does not have any negative values, yet it still maintains the 100º difference between the freezing point and boiling point of water that the Celsius scale has and can thus easily be converted to the Celsius scale by merely subtracting 273º from the temperature on the Kelvin scale.                                                                 (Adapted from TOEFL Reading Practice by Deborah Philips) What is the main idea of the passage?

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