1. (2019高一下·南海月考) 阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    Students perform less well in final exams if smartphones are allowed in class, for non-academic (非学业的) purposes in lectures, a new study in Educational Psychology finds. Students who don't use smartphones themselves but attend lectures where their use is acceptable also do worse, suggesting that smartphone use damages the group learning environment.

    Researchers from Rutgers University in the US performed an in-class experiment to lest whether dividing attention between smartphones and the lecturer during the class affected students' performance in within-lecture tests and a final exam. 118 students at Rutgers University took part in the experiment during one term of their course. Smartphones were not allowed in half of the lectures and allowed in the other half. When smartphones were allowed, students were asked to record whether they had used them for non-academic purposes during the lecture.

    The study found that having a smartphone didn't lower students' scores in comprehension tests within lectures, but it did lower scores in the final exam by at least 5%, or half a grade. This finding shows for the first time that the main effect of divided attention in the classroom is on the length of time in keeping memory, with fewer things of a study task later remembered. In addition, when the use of smartphones was allowed in class, performance was also poorer for students who did not use them as well as for those who did.

    The study's lead author, Professor Arnold Glass, added: "These findings should alarm students and teachers that dividing attention is having a not obvious but harmful effect that is damaging their exam performance and final grade. To help manage the use of smartphones in the classroom, teachers should explain to students the alarming effect—not only for themselves, but for the whole class."

    This is the first-ever study in an actual classroom showing a relationship between losing attention from smartphones and exam performance. However, more researches are required to see how students are affected by using smartphones after school.

1. （1） What is the purpose of paragraph 1?

   A . To present the main findings of the experiment. B . To explain how the experiment was carried out. C . To give details about the result of the experiment. D . To suggest what should be done for teachers and students.
3. （2） We know from the experiment that having a smartphone in class ________.

   A . had no bad effect if students do not use them B . caused an average 5% drop in students' scores C . made it harder for students to keep things in mind D . had a bad effect on students' performance in all tests
5. （3） What's Professor Glass' attitude towards using smartphones in class?

   A . He was against it. B . He was in favor of it. C . He cared little about it. D . He doubted the findings.
7. （4） What is the research team likely to do next?

   A . To find out ways to improve students' memory. B . To call on schools to ban smartphones completely. C . To study the influence of using smartphones after class. D . To do researches on focusing attention in actual classrooms.