Researchers performed experiments that aimed to find out whether using a laptop increased the tendency to make notes "mindlessly" by taking down word for word what the professors said．

In the first experiment， students were given either a laptop or pen and paper．They listened to the same lectures and were told to use their usual note-taking skills．Thirty minutes after the talk， they were examined on their ability to remember facts and on how well they understood concepts．

The researchers found that laptop users took twice as many notes as those who wrote by hand．However，the typists performed worse at remembering and applying the concepts．Both groups scored similarly when it came to memorizing facts．

The researchers' report said，"While more notes are beneficial，if the notes are taken mindlessly，as is more likely the case on a laptop，the benefit disappears．"

In another experiment aimed at testing long-term memory，students took notes as before but were tested a week after the lecture．This time，the students who wrote notes by hand performed significantly better on the exam．

These two experiments suggest that handwritten notes are not only better for immediate learning and understanding，but that they also lead to superior revision in the future．

21．More and more students favor laptops for note-taking because they can _______ ．

A．write more notes

B．digest concepts better

C．get higher scores

D．understand lectures better

22．While taking notes，laptop users tend to be _______．

A．skillful

B．mindless

C．thoughtful

D．tireless

23．The author of the passage aims to _______ ．

A．examine the importance of long-term memory

B．stress the benefit of taking notes by hand

C．explain the process of taking notes

D． promote the use of laptops

24．The passage is likely to appear in ______ ．

A．a newspaper advertisement

B．a computer textbook

C．a science magazine

D．a finance report

解读：本文是一篇说明文。本文揭示实验研究的结果，用笔记本电脑记笔记的人记忆和应用概念的能力较差，而用手记笔记的人在考试中的表现更好。

21．A 细节理解题。根据第二段第一句"Students are increasingly using laptops for note-taking because of speed and legibility（清晰度）"可知，学生越来越多地使用笔记本电脑记笔记是因为它的速度和清晰度，这说明用笔记本电脑记笔记速度快记得多。故选A。