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I used to be a master of multitasking — doing many things at once. Living in a big city, I answered emails while walking, watched TV while planning work, and mentally listed tasks during dinner with friends. At first, I saw this as a useful skill that made me productive. But slowly, I started to feel scattered. I could not fully enjoy anything — even relaxing moments like a walk or coffee with a friend — because my mind was always elsewhere. My stress grew, and I felt far away from my own life.

So I decided to try an experiment: no multitasking for one full week. The rule was simple — do one thing at a time. Experts explain that multitasking only feels productive. When you jump between tasks, your brain gets a small feeling of excitement, which makes you think you are busy and getting things done. However, your brain is switching attention rapidly. Each switch costs brain energy, and after a while, you feel tired, unable to focus, and easily upset. That was exactly how I felt.

To break the habit, I started small. I set a 25-minute timer for focused work and put my phone in another room. During online meetings, I made the screen full and even sat on my hands to avoid touching my phone. I also cut down small decisions by preparing my clothes and bag the night before, which made my mornings calmer. At first, doing one thing at a time felt strange, but soon the need to constantly check something faded.

By the end of the week, I wasn’t perfectly focused, but I felt much less scattered. My attention improved, and I enjoyed simple things like watching a show or cooking dinner because my mind was not pulled in many directions. The biggest lesson? A clear mind comes from giving your brain fewer interruptions. Experts recommend starting with one small habit — like taking a walk without your phone or having a meal without checking messages. The goal is not perfection, but letting your brain do one thing at a time.

1.1. How did the author first view multitasking?

A A source of stress.

B A sign of weakness.

C A helpful habit.

D A waste of time.

解析：选C。C细节理解题。根据第一段中的“I saw this as a useful skill that made me productive”可知，作者最初认为多任务处理是一种有用的技能，能让自己更高效。选项C “一个有用的习惯”是对原文的同义转述。故选C。

2.2. What does the underlined word “That” in paragraph 2 refer to?

A The worn-out and annoyed feeling.

B The simple experiment rule.

C The excitement from switching.

D The need to focus better.

解析：选A。A词意指代题。第二段最后一句“That was exactly how I felt”中的“That”指代前文描述的 “you feel tired, unable to focus, and easily upset”这种疲惫、烦躁的状态。选项A “The worn-out and annoyed feeling”是对该感觉的同义转述，其中“worn-out”对应“tired”，“annoyed”对应 “easily upset”。故选A。

3.3. What can we infer from the author’s experience in paragraph 3?

A She lost interest in her work.

B She struggled to avoid checking.

C She enjoyed morning meetings.

D She prepared less than before.

解析：选B。B推理判断题。第三段提到作者在开会时“sat on my hands to avoid touching my phone”，可以推断出她需要刻意控制自己查看手机的冲动，说明摆脱这个习惯很困难。选项B“她努力避免查看（手机）”是基于原文行为的合理推断。故选B。

4.4. What is the main idea of the last paragraph?

A Multitasking is more efficient.

B Perfection is the key.

C Single-tasking brings mental clarity.

D Experts doubt the experiment.

解析：选C。C段落大意题。最后一段的核心是作者通过实验感悟到：清晰的大脑来自减少干扰，而“一次只做一件事”正是实现这一目标的方法，目标并非完美。选项C“单任务处理带来头脑清晰”概括了这一主旨。故选C。