阅读判断：The Theory of everthing.
Can you Hear This?
Sports Star Yao Ming.
补全短文：What is a Dream?（仅此题为书上原文）
完形填空：Warmer Climate will Back Tropical Buys.
Can you hear This ？
When something creates a sound wave in aroom 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 the reflected wave or reverberant （反射的） sound ， which can beheard even after the sound is no longer coming from the source .
The reverberation time of an auditorium isdetermined by the volume or interior size of the auditorium .It is alsodetermined 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 suchas Wagner operas or Mahler symphonies should have a long reverberation time.The light ，rapid musical passagesof Bach or Mozart need a reverberation time somewhere between .
Acoustic problems often are caused by poorauditorium design .Smooth ， curved （弯曲的）reflecting surfaces create large reflections . Parallel （平行的）walls reflect sound back and forth， creating a rapid ，repetitivepulsing（有节奏的跳动）effect. Largepillars （柱）and corners can causeacoustic shadows as the sound waves try to pass around the object. Some ofthese problems can be solved by using absorbers and relectors to change thereverberation time of a room .For example ， hanging large reflectors ， called clouds ， over theperformers will allow some sound frequencies to reflect and others to pass toachieve 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 soundfuller in an auditorium with
A a short reverberation time
B a long reverberation time
C an intermediate reverberation time
D no reverberation time
【解析】文章第二段说The full-soundperformance of music such as Wagner operas or Mahler symphonies should have along reverberation time，由此可知选B。
3.This passage suggests that a goodauditorium should
A achieve a pleasing mixture of sound
B get rid of all reflections
C not have absorbers.
D have smooth surfaces【答案】A
【解析】通过文章最后一句For example,hanging large reflectors, called clouds, over the performers will allow somesound frequencies to reflect and others to pass to achieve a pleasing mixtureof sound可知应选A。
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
【解析】文章最后一段说Large pillarsand corners can cause acoustic shadows as the sound waves try to pass aroundthe object，可知答案选C。5.The word "acoustic "in the last paragraph has somethingto do with
D noise Smart Window