There is a belief among many educators that student attention peaks during the first 15 minutes of classroom instruction—a(n)(1)

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问题     There is a belief among many educators that student attention peaks during the first 15 minutes of classroom instruction—a(n)(1)_____ idea, according to a recent study completed at Kennesaw State University.
    According to the study, one(2)_____ that can impact whether students(3)_____ their focus during the lecture is dependent on(4)_____ they sit in the classroom. The study’s authors "noticed that students in the front and middle of the classroom" stayed on(5)_____, while students who sat in the back of the classroom were more(6)_____.
    Professors face many(7)_____ to compete for their students’ attentions in the classroom—texting, social media, and in-class(8)_____ talk among students, to name a few—(9)_____ there are steps educators can take to re-focus the class during a lecture, the study’s authors note.
    "When the professor became very(10)_____, drew something on the board,(11)_____ humor or if he was using(12)_____ that were not listed in the power point slides then the students tended to (13)_____ him," the authors write.
    According to the study, students also(14)_____ to pay more attention when the professor went over answers from a quiz, introduced a new slide or information, or shared videos with the classroom. But one move that many professors make, which may be(15)_____ among students, could have a(n)(16)_____ impact on in-class focus: (17)_____ notes from the lecture before the start of class.
    "If students printed out notes available to them before lecture... they seemed to pay(18)_____ attention to the board," the study’s authors write, "and tended to get off task more(19)_____ than those students who had to(20)_____ everything down."
(15)

选项 A、commonplace
B、acceptable
C、problematic
D、popular

答案D

解析 根据该段最后冒号后的提示“在上课前将课堂笔记提供给学生”,可以判断这种行为在学生中还是很“受欢迎的”,用popular。commonplace“普通的”;acceptable“可接受的”;problematic“成问题的”。
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