科普环保类astound
2021高考英语真题分类拔高练习011.（2020·天津）阅读理解 sw是什么
For people, who are interested in sound, the field of sound technology is definitely making noi. In the past, sound engineers worked in the back rooms of recording studios, but many of today's sound professionals are sharing their knowledge and experience with professionals in other fields to create new products bad on the phenomenon we call sound.
Sound can be ud as a weapon. Imagine that a police officer is chasing a thief. The thief tries to escape. And the officer can't let him get away. He pulls out a special device, points it at the suspect, and switches it on. The thief drops to the ground. This new weapon is called a Long Range Acoustic Device(LRAD, 远程定向声波发射器). It produces a deafening sound so painful that it temporarily disables a person. The noi from the LRAD is directed like a ray of light and travels only into the ears of that person, but it is not deadly.
For tho who hunger for some peace and quiet, sound can now create silence. Let's say you are at the airport, and the little boy on the at next to you is humming(哼唱) a short commercial song. He hums it over and over again, and you are about to go crazy. Thanks to the Silence Machine, a British invention, you can get rid of the sound without uptting the boy or his parents. One may wonder how the Silence Machine works. Well, it functions by analyzing the waves of the incoming sound and creating a cond t of outgoing waves. The two ts of waves cancel each other out. Simply turn the machine or point it at the target, and your peace and quiet comes back.
Directed sound is a new technology that allows companies to u sound in much the same way spotlights(聚光灯) are ud in the theater. A spotlight lights up only one ction of a stage; similarly, "spotsound" creates a circle of sound in on targeted area. This can be uful for business such as restaurants and stores becau it offers a new way to attract customers. Restaurants can offer a choice of music along with the various food choices on the menu, allowing customers more control over the atmosphere in which they are dining. Directed sound is also beginning to appear in shopping centers and even
at homes.
（1）What could be inferred from Paragraph 2 about the effect of the LRAD?
A.It caus temporary hearing loss.
B.It slows down a running man.
C.It makes it easy to identify a suspect.
D.It keeps the suspect from hurting others.
（2）The Silence Machine is a device specially designed to ________.
分辩
prepA.silence the people around you
B.remove the sound of commercialsshanke
C.block the incoming sound waves
D.stop unwanted sound from affecting you
（3）What feature do spotsounds and spotlights share?
A.They travel in circles.
怎么控制自己的脾气B.They clear the atmosphere.
C.They can be transformed into energy.
D.They can be directed onto a specific area.
（4）Directed sound can be ud for ________.
A.creative designs of restaurant menus
B.ideal sound effects on the theater stage
C.different choices of music for business
D.strict control over any suspicious customer
桂林环球雅思
（5）What does the passage focus on?
homework
A.How professionals invented sound products.澳洲硕士预科
B.Inventions in the field of sound technology.
C.The growing interest in the study of sound.
D.How sound engineers work in their studios.
陈巨飞被北大录取了吗
2.（2020·江苏）阅读理解
For tho who can stomach it, working out before breakfast may be more beneficial for health than eating first, according to a study of meal timing and physical activity.
Athletes and scientists have long known that meal timing affects performance. However, far less has been known about how meal timing and exerci might affect general health.
To find out, British scientists conducted a study. They first found 10 overweight and inactive but otherwi healthy young men, who lifestyles are, for better and wor, reprentative of tho of most of us. They tested the men's fitness and resting metabolic (新陈代谢的) rates and took samples (样品) of their blood and fat tissue.
Then, on two parate morning visits to the scientists' lab, each man walked for an hour at an average speed that, in theory should allow his body to rely mainly on fat for fuel. Before one of the workouts, the men skipped breakfast, meaning that they exercis
ed on a completely empty stomach after a long overnight fast (禁食). On the other occasion, they ate a rich morning meal about two hours before they started walking.
Just before and an hour after each workout, the scientists took additional samples of the men's blood and fat tissue.
Then they compared the samples. There were considerable differences. Most obviously, the men displayed lower blood sugar levels at the start of their workouts when they had skipped breakfast than when they had eaten. As a result, they burned more fat during walks on an empty stomach than when they had eaten first. On the other hand, they burned slightly more calories (卡路里), on average, during the workout after breakfast than after fasting.
