Many instructors believe that an informal, relaxed classroom environment is【1】to learning and innovation. It is not uncommon

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问题     Many instructors believe that an informal, relaxed classroom environment is【1】to learning and innovation.
    It is not uncommon for students to have【2】and friendly relationships with their professors.
    The【3】professor is not necessarily a poor one and is still【4】by students. Although students may be in a(n)【5】position, some professors treat them as【6】.However, no matter how【7】professors would like to be, they still are in a position of【8】.
    Professors may【9】social relationships with students outside the classroom, but in the classroom they【10】the instructor’s role. A professor may have coffee one day with students【11】the next day expect them to【12】a deadline for the【13】of a paper or to be. Prepared【14】a discussion or an exam. The professor may give【15】attention outside of class to a student in【16】of help but probably will not treat him or her differently when it【17】evaluating school work. Professors have several roles【18】students; they may be counselors and friends as well as teachers. Students must【19】that when a teacher’s role changes, they must appropriately【20】their behavior and attitudes.

选项 A、sustain
B、support
C、maintain
D、retain

答案C

解析 此四个选项的意思分别是:sustain承受,经受;support支持,帮助;maintain维持,坚持;retain保持,保留。由题意知,课堂里教授维持的是导师的角色。所以正确答案是C选项。
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