2. 外语
  3. Many instructors believe that an informal, relaxed classroom environment is【C1】______to learning and innovation. It is not u

Many instructors believe that an informal, relaxed classroom environment is【C1】______to learning and innovation. It is not u

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问题     Many instructors believe that an informal, relaxed classroom environment is【C1】______to learning and innovation.
    It is not uncommon for students to have【C2】______and friendly relationships with their professors.
    The【C3】______professor is not necessarily a poor one and is still【C4】______by students. Although students may be in a(n)【C5】______position, some professors treat them as【C6】______. However, no matter how【C7】______professors would like to be, they still are in a position of【C8】______.
    Professors may【C9】______social relationships with students outside the classroom, but in the classroom they【C10】______the instructor’s role. A professor may have coffee one day with students【C11】______the next day expect them to【C12】______a deadline for the【C13】______of a paper or to be prepared【C14】______a discussion or an exam. The professor may give【C15】______attention outside of class to a student in【C16】______of help but probably will not treat him or her differently when it【C17】______evaluating school work. Professors have several roles【C18】______students; they may be counselors and friends as well as teachers. Students must【C19】______that when a teacher’s role changes, they must appropriately【C20】______their behavior and attitudes."
【C15】
选项 A、due
B、extra
C、sufficient
D、supplementary
答案B
解析 四个选项的意思分别是：due应得的；extra额外的；sufficient足够的；supplementary附加的，补充的。根据语境，教授课堂之外的关心注意，应该是额外的。四个选项中只有B选项有此意，所以正确答案是B选项。
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