《2026年薪火金卷高考仿真模拟卷英语》

D
Someday, you may no longer need to brush your teeth by hand. Instead, a group of billions of
nanoparticles(纳米粒子) could automatically do all that work for you. It would be especially life-
changing for people who find it difficult or impossible to hold and move a toothbrush.
Steager, an engineer at the University of Pennsylvania (Penn) in Philadelphia and Hyun
Koo, an inventor and dental researcher there, found a way to form the nanoparticles into long,
skinny bristles(刷毛), a lot like the ones on a toothbrush. But these bristles shape-shift to fit
whatever surface they encounter.
The tooth-cleaning robot works thanks to two magnets. One goes each side of the teeth. The
nanoparticles sit in a liquid between the magnets. When the magnets are turned off, the
nanoparticles move randomly in the liquid. As soon as one magnet gets turned on, the
nanoparticles gather together near its center. When the researchers turn on the other magnet and
turn off the first one, the nanoparticles extend outward in long, skinny bristles. When there’s a
tooth in the way, these bristles can’t stretch out as far as they want. So they push against the
tooth’s surface. If there’s a gap between teeth, they push into the gap. Moving the magnets makes
the bristles move against and between teeth. All that motion cleans the teeth. As a bonus, the
nanoparticles also have strong power to kill viruses.
The new device is just a proof of concept. The researchers still need to turn it into a product
that people will want to use. “There’s a lot of engineering to get from here to there, but every
good idea needs to have a start,” says Steager.
32. What is special about the tooth cleaner?
A. It’s water-proof.
B. It’s transformable.
C. It looks like a toothbrush.
D. It contains skinny bristles.
33. What is Paragraph 3 mainly about?
A. The working principle.
B. The magnets’ motion.
C. The virus-killing process.
D. The bristles’ formation.
34. How does Steager feel about the future of the device?
A. Uncertain.
B. Confident.
C. Concerned.
D. Surprised.
35. Which of the following would be the best title?
A. A Tooth-Cleaner Fighting Bacteria
B. A Breakthrough in Medicine
C. A Shape-Shifting Robotic Tooth-Cleaner
D. A New Concept for a New Start

答案： D
【语篇解读】 本文是一篇说明文。文章介绍了一
款纳米材料的机器人洁牙器。
32. B [细节理解题。根据第二段中的“But these
bristles shape-shift to fit whatever surface they
encounter.”可知,这个洁牙器能根据口腔内的情
况而变形。]
33. A [段落大意题。根据第三段内容可知,该段介
绍的是这款洁牙器的工作原理。]
34. B [观点态度题。根据最后一段内容可知,斯泰格
尔认为这个洁牙器从概念到产品,还需要很多筹
划,但是不失为一个好的想法。由此可知,斯泰格
尔对这款产品很有信心。]
35. C [标题归纳题。通读全文,尤其是根据第一段内
容、第二段最后一句可知,文章主要介绍了一款纳
米材料的洁牙器,它在口腔中会根据具体情况而变
形。C 项最适合作为文章标题。]