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听力原文： The last radical change in cinema was the development of color. Colored photography was possible from the 1860s, but early films were normally black and white and any coloring was painted on by hand—an expensive, slow and not very effective technique.
In 1922 the first real color films were produced, using a two-color system called Technicolor. It was quite common at that time to film whole sequences in one color and the attempts to mix colors to get realistic effects were not very successful, in 1932 Technicolor was improved by the use of three main colors and, in general, the same system is used today.
Color took longer to be accepted than sound. It was expensive and people often felt, oddly, that it was less realistic than black and white. This was partly, of course, because the quality was not always very high and so the scenes could look very peculiar. Since the 1930s there have been many improvements in the techniques of cinema, and the style. of acting has changed a good deal. But after fifty years the basics—moving pictures, color and sound are still the same.
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听力原文： London—even its very name suggests history and might. Its opportunities for entertainment by day and night go on and on and on. It's a city that excites visitors from all over the world. There are many different types of people doing many different types of things such as workers, business people, tourists, students, beggars, and queens. The city is so large that visitors will need to make use of the tube or London underground. A ride on a red double-decker bus is also possible and helps a visitor to know the city. The area of London is 1,572 square kilometers with a population of about 7.2 million people. The main geographical feature of the city is the river Thames, which flows through central London, dividing it into northern and southern halves. The central area and the most important sights, theatres and restaurants are on the north bank of the river. South London includes a mess of poor, dirty suburbs, such as Brixton, which have people from many different cultures.
London is a year-round tourist centre; places are open during the winter. The best chance of good weather is, of course, at the height of summer in July and August, but there's certainly no guarantee of sun even in those months plus it's when you can expect the biggest crowds and highest prices.
There are countless festivals and events in London. The first one each year is the New Year's Eve fireworks and street party in Trafalgar Square, followed by the New Year's Day Parade. In early May serious racers take part in the London Marathon. The Queen's Birthday Parade is held in June; Wimbledon, the famous tennis match, also runs for two weeks in the same month. In short, interesting festivals happen all year for tourists to enjoy.
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【B20】
A．Because it was so cheap.B．Because the quality was too high.C．Because people thought
Students can choose lodgings where some facilities are provided, but the coat of water is
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