1. (2022高二下·河南竞赛) 阅读理解

For people, who are interested in sound, the field of sound technology is definitely making noise. 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 based on the phenomenon we call sound.

Sound can be used 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 noise 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 those who hunger for some peace and quiet, sound can now create silence. Let's say you are at the airport, and the lttle boy on the seat 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 upsetting 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 second set of outgoing waves. The two sets 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 use sound in much the same way as spotlights(聚光灯) are used in the theater. A spotlight lights up only one section of a stage; similarly, "spotsound" creates a circle of sound in one targeted area. This can be useful for businesses such as restaurants and stores because 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 to have 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. （1） How does the police officer make the thief drop to the ground?

   A . By injuring one of the thief's legs. B . By directing a ray of light at the thief. C . By frightening the thief to some degree. D . By making the noise travel into the thief's ears.
3. （2） What do we know about the Silence Machine?

   ①It can be pointed at the target.
   ②It can lower the sound around you.

   ③It can silence the people around you.
   ④It can check the waves of the incoming sound.

   ⑤It can send out a second set of outgoing waves.

   A . ①④⑤ B . ②④⑤ C . ③④⑤ D . ②③⑤
5. （3） What does the last paragraph mainly tell us?

   A . Why spotlights are used in the theater. B . What practical uses of directed sound are. C . How directed sound travels in certain places. D . How restaurants and stores attract customers.
7. （4） What does the text concentrate on?

   A . Ways sound products were invented. B . New theories about the working of sound, C . New products based on sound technology. D . Ways sound scientists cooperate with others.