2020年职称英语考试真题及答案(理工类B级)

2020年职称英语考试真题及答案(理工类B级)

Can you hear This ?

When something creates a sound wave in a room or an auditorium (礼堂)，listeners hear the sound wave directly from the source. They also hear the reflections as the sound bounces off the walls , floor ,and ceiling . These are called the reflected wave or reverberant (反射的) sound , which can be heard even after the sound is no longer coming from the source .

The reverberation time of an auditorium is determined by the volume or interior size of the auditorium .It is also determined by how well or how poorly the walls , ceiling, floor , and contents of the room (including the people ) absorb sound. There is no ideal reverberation time .The full-sound performance of music such as Wagner operas or Mahler symphonies should have a long reverberation time . The

light ,rapid musical passages of Bach or Mozart need a reverberation time somewhere between .

Acoustic problems often are caused by poor auditorium design .Smooth , curved (弯曲的)reflecting surfaces create large reflections . Parallel (平行的)walls reflect sound back and forth, creating a rapid ,repetitive pulsing(有节奏的跳动)effect. Large pillars (柱)and corners can cause acoustic shadows as the sound waves try to pass around the object .

Some of these problems can be solved by using absorbers and relectors to change the reverberation time of a room .For example , hanging large reflectors , called clouds , over the performers will allow some sound frequencies to reflect and others to pass yo achieve a pleasing mixture of sound.

1.This Passage is mainly about

A sound waves and their acoustic effect .

B the types of music orchestras play

C walls of an auditorium

D the design of an auditorium

2.Wagner operas and Mahler symphonies sound fuller in an auditorium with

~ 2 / 3 ~

A a short reverberation time

B a long reverberation time

C an intermediate reverberation time

D no reverberation time

3.This passage suggests that a good auditorium should

A achieve a pleasing mixture of sound

B get rid of all reflections

C not have absorbers.

D have smooth surfaces

rge pillars and corners may

A make sound rich and full

B be cures for sound problems

C be sources of sound problems