组卷网 > 高中英语综合库 > 主题 > 人与社会 > 科普与现代技术 > 科学技术
题型:语法填空-短文语填 难度:0.65 引用次数:270 题号:7964837
语法填空

Non-Hermitian wave engineering is     1    recent and fast-moving field that examines both fundamental and application-oriented phenomena. One such phenomenon is coherent perfect absorption-an effect commonly     2    (refer) to as ‘anti-lasing' because it corresponds to the time-reversed process of coherent emission of radiation at the lasing threshold (where all radiation losses are exactly balanced by the optical gain).

Coherent perfect absorbers have been     3    (experimental)realized in several setups with the notable exception of a CPA     4    a disordered medium. Such a ‘random CPA' would be the time-reverse of a ‘random laser, in    5    light is resonantly enhanced by multiple scattering inside a disorder. Because of the    6    (complex) of this scattering process, the light field emitted by a random laser is also spatially complex and not focused like a regular laser beam. Realizing a random CPA (or ‘random anti-laser') is therefore    7    (challenge) because it requires the equivalent of time-reversing such a light field in all    8    degrees of freedom to create coherent radiation that is perfectly absorbed when     9    (impinge) on a disordered medium. Here we use microwave technology    10    (build) a random anti-laser and demonstrate its ability to absorb suitably engineered incoming radiation fields with near-perfect efficiency.

【知识点】 科学技术

相似题推荐

语法填空-短文语填(约180词) | 适中 (0.65)
名校
文章大意:本文是一篇说明文。文章阐述的是新汽车科技令驾驶更安全更容易。
【推荐1】语法填空

Some new car models are fashionable. Others can go a long way with only a little gas. But all are taking advantage of technology that is making driving safer and     1     (easy).

The new Ford Escape has technology that helps the car avoid crashes. A new control system changes the car’s speed     2     (keep) a safe distance from other cars on the road. It works     3     using sensors that measure the Escape’s distance from other vehicles.     4     (drive) can connect to the Ford Escape’s electronic system with their smartphone. The phone can start and track their car from anywhere.

    5     emergency vehicles are near, the Heedful Audio Alert System, or HAAS, will warn drivers. The device has a sensor     6     detects (发现) the sound of an emergency vehicle siren (汽笛). The device then     7     (send) a warning to the drivers phone.

A company     8     (call) Sober Steering has developed a device to stop drunken drivers. The device can detect alcohol in the skin. If the driver’s alcohol level is too high,     9     will shut down the vehicle.

Just as technology is changing life at home and at work, it     10     (change) life on the road as well.

2018-02-25更新 | 207次组卷
语法填空-短文语填(约200词) | 适中 (0.65)
【推荐2】阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

China has landed on the moon three times, and even managed     1    (bring) one of its robotic lunar explorers back to Earth. The country’s space agency     2    (complete) a key step toward landing on Mars on Wednesday when Tianwen-1, the spacecraft     3     (send) last July, began its orbit of the red planet, according to state media reports. By accomplishing this feat, China completed its first     4     (success) journey to another planet in our solar system.

The spacecraft was also the second to arrive at Mars in two days,     5     (follow) a United Arab Emirates probe that began orbiting the neighboring world on Tuesday.

China is expected to try to place a lander and a robotic rover on the planet later this year. It would join     6     could by then be a trio of NASA spacecraft studying the Martian surface.

Tianwen-1 left Earth last summer, taking advantage of a period     7     Mars and Earth were closest to each other during their journeys around the sun. That allowed a     8    (relative) short transit between the two worlds. The probe sent back pictures of the red planet     9     a distance of about 1.3 million miles.

But while the     10    (arrive) at Mars was a new milestone for China's space program, a bigger challenge for the Tianwen-1 mission is a few months away.

2021-04-22更新 | 87次组卷
语法填空-短文语填(约330词) | 适中 (0.65)
名校
文章大意:这是一篇说明文。文章主要介绍了人们沉迷于科技的现象。
【推荐3】阅读下面短文, 在空白处填入1个适当的单词或括号内单词的正确形式。

Tell me if this sounds familiar. You wake up in the morning and immediately reach for your phone. You check for new emails and texts despite having no urgency to do so.

    1    (satisfy)that you haven’t missed any important messages, you log onto Facebook. You check to see whether your friends posted any updates while you were sleeping.

Then it’s off to Tik Tok. You follow hundreds of friends, acquaintances, and celebrities. Surely someone has posted something worthy     2       (read). Unfortunately, they haven’t.

With nothing of interest     3     (happen)on social media, you visit your favorite news media sites to find out what’s going on in the world. After all, you don’t want to miss the day’s major headlines.

And so the morning     4     (progress). From the moment you wake up     5     you’ve thrown the first cup of coffee down your throat, your attention is dominated by technology. Texts, emails, social media, games, news headlines, blogs, and YouTube videos hold you captive in a vice-like grip.

Worse, the rest of the day follows the same course. Your phone buzzes,     6     (signal) the arrival of a new text and you find yourself unable to resist checking it. You receive a notification in your browser that a new email has arrived and you immediately drop everything to read it. You visit Facebook, promising     7     that you’ll only spend a few minutes, only to surf    8       (aim)for an hour.

If you relate to the above circumstances, I have bad news. You     9     (addict) to technology. The good news is that you’re not alone. Millions of people experience and act upon the same compulsions every single day. These are the reasons why it’s so easy to develop an addiction to technology. First, you have the necessary tools at your disposal 24 hours a day. Second,     10     you use them, you stimulate your brain’s reward system over and over and over again. Under these circumstances, dependency and addiction are practically predictable conclusions.

2022-10-30更新 | 78次组卷
共计 平均难度:一般