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on of the TextUnit 5答案XII.Build more tall apartment buildings. The increase in population in cities is creating a housing problem. To solve the problem, onefamily houses and older ones are being pulled down to make room for tall apartment buildings. When building space on the ground is used up, we can make use of the space in the air. This will help solve the housing problem in cities.Unit 6答案XII. People e to Beijing for different purposes. Thousands upon thousands of foreign students are studying different subjects at universities in Beijing. Every year a large number of foreign businessmen from all pats of the world visit Beijing, for various kinds of business talks or international conferences. In addition travelers both at home and abroad e to Beijing for visiting places of historic interest during their holidays or visiting their friends and relatives in Beijing. Unit 7答案 XII. Analysis:The set of actions leading to the main idea:got up to his feet, found the keys, entered his house and called 911the operator took a des cription and sent a police carhad a drink, the policemen came and took a reportMain idea: He reported the robbery to the police.Structured WritingXIII. I climbed the ladder, heard my dive announced, and started the moves to thrust myself into the air. Then I dove into the pool. I enjoyed the quietness underwater, and then swam to the side of the pool. I was wondering about my score when suddenly, my coach leaped into the air. The crowd cheered, and I knew I’d won the gold medal