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  3. Teaching is a highly-complex occupation. It has been described in terms of very different types of roles. For example, teachers

Teaching is a highly-complex occupation. It has been described in terms of very different types of roles. For example, teachers

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问题     Teaching is a highly-complex occupation. It has been described in terms of very different types of roles. For example, teachers manage time, material, knowledge, and students. They are expert communicators with their students as well as parents and other adults within the school. They are decision makers, making numerous decisions in one class period.
    In their basic role as instructors, teachers have a number of methods for involving their students in the content of the curriculum. The most popular, by far, is the lecture technique. Excluding lab periods, approximately 90% of college teaching is lecture technique. The figure is somewhat lower at the secondary level, and lower still in primary school classrooms. Secondary school teachers also rely extensively on seatwork, during which students work at their desks on a task, and teachers circulate to answer questions or sit at their own desks and correct the seatwork. Many teachers in secondary classes use discussions to stimulate their students’ interest, and to evaluate their grasp of the material. Discussions go beyond the usual question-and answer sequences that accompany lectures, because they are meant to help students extend their knowledge through higher-level thinking.
    Grouping of students within the classroom occurs primarily at the elementary level. This organizational arrangement places students together in two or more groups in the classroom to improve the learning conditions for those students. Grouping in reading places students of the same achievement level together to enable the teacher to more easily work with them. Grouping, however, is becoming more popular in other subjects, and for other purposes. Cooperative(协作的) learning groups, for example, place students of different abilities in the same group, and the students within that group help each other on assignments. These programs have been shown to be effective in raising students’ achievement as well as improving their social skills and attitudes toward one another.
Teaching is a highly-complex occupation because __________.
选项
答案teachers take on various kinds of roles
解析 细节题。依据是首段第二句It has been described in terms of very different types of roles。
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