时间:2016-04-07 15:19:35
第4部分：阅读理解(第31——45题，每题3分，共45分)
下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。
第一篇
Can you hear this?
When something creates a sound wave in a room or an auditorium (礼堂)listenershear the sound wave directly from the source. They also hear the reflections asthe sound bounces off the walls, floor, and ceiling . These are called thereflected wave or reverberant (反射的) sound, which can be heard even after thesound is no longer coming from the source .
The reverberation time of an auditorium is determined by thevolume orinterior size of the auditorium .It is also determined by how well orhow poorlythe walls, ceiling, floor, and contents of the room (including thepeople) absorbsound. There is no ideal reverberation time .The full-soundperformance of musicsuch as Wagner operas or Mahler symphonies should have along reverberation time.The light, rapid musical passages of Bach or Mozartneed a reverberation timesomewhere between.
Acoustic problems often are caused by poor auditorium design .Smooth , curved(弯曲的)reflectingsurfaces create large reflections . Parallel (平行的)walls reflectsound back andforth, creating a rapid ,repetitive pulsing(有节奏的跳动)effect. Largepillars (柱)andcorners can cause acoustic shadows as the sound waves try to passaround theobject . Some of these problems can be solved by using absorbers andrelectorsto change the reverberation time of a room .For example , hanginglargereflectors , called clouds , over the performers will allow somesoundfrequencies to reflect and others to pass yo achieve a pleasing mixtureofsound.
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
A a short reverberation time
B a long reverberation time
C an intermediate reverberation time
D no reverberation time
3. Thispassage 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
4.Large pillars and corners may
A make sound rich and full
B be cures for sound problems
C be sources of sound problems
D function as well as clouds
5.The word “acoustic” in the last paragraph has something to do with
A performance B Music
C sound D noise
Birds of a feather flock together. 物以类聚,人以群分.