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

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

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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【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 of 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、extra
B、due
C、sufficient
D、supplementary
答案A
解析 四个选项的意思分别是：extra额外的；due预期的：sufficient充足的；supplementary补充的。give extra attention意为“额外注意”，符合语境。因此正确答案是选项A。
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