题目

以下各种微生物，属于单细胞结构的是（ ） A . 青霉 B . 曲霉 C . 烟草花叶病毒 D . 酵母菌 答案：D20、In Colombia , there are some unwritten rules that people are used to , These rules are not officially established , but people do respect them . For example , on a bus , a person keeps a distance from another person , and people don’t like to touch each other . Many people come to work late because they prefer to wait for another bus if the first one is too crowded . They don’t want to have to stand too close to another person , or maybe they are afraid of starting a conversation . A friend of mine in Colombia once said his mom got angry because he came home late , so he asked her , “ Mom , what do you think of most people arriving at their jobs so late ? ”  The mother kept silent as she knew no one wants to get on a bus that is too crowded . His mother realized at that moment that customs have a big influence on a person’s life . Sometimes , people don’t like to make any kind of conversation or make eye contact with others . For example , when they are in line at a bank , they prefer to look up or down rather than look at other people . Moreover , people usually look down when they are in an elevator . Not only on a bus , in line at a bank , and in an elevator do people usually avoid talking to other people , but also in the streets when they are walking , they prefer to look down and to avoid contact with others . 67. Why do many people get to work late in Colombia ?    A. They always think the next bus will be better .    B. They don’t want to get on crowded buses .    C. It’s an official rule in Colombia .    D. They get into conversations and miss their buses . 68. From the text we learn that __________ .    A. customs influence people’s lives      B. a mother always understands her son    C. people respect each other in Colombia     D. people like to talk in elevators in Colombia 69. When people in Colombia are in line at banks , they __________ .    A. make eye contact          B. look at other people    C. make conversation         D. look up or down 70. What would be the best title for the text ?    A. What People Do in Different Situations   B. Avoid Getting on a Crowded Bus    C. Special Customs in Colombia           D. Obeying Unwritten Rules 评卷人 得分 四、短文改错 （每空？ 分，共？ 分）