the future of press
Can you hear This?
When something creates a sound wave in a room or an auditorium, 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. Because each use of an auditorium calls for different reverberation. Speech needs to be understood clearly: therefore rooms used for talking must have a short 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 reflecting surfaces create large reflections. Parallel(平行的)walls reflect sound back and forth, creating a rapid, repetitive pulsing 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 reflectors 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 to achieve a pleasing mixture of sound.
41.【题干】This passage is mainly about_____
A.sound waves and their effects.
B.the types of music orchestras play.
C.walls of an auditorium.
D.the design of an auditorium.
42.【题干】Wagner operas and Mahler symphonies with full-sound effect have_____
A.a short reverberation time.
B.an intermediate reverberation time.
C.no reverberation time.
D.a long reverberation time.
43.【题干】This passage suggests that a good auditorium should_____
A.get rid of all reflections.
B.not have absorbers.
C.achieve a pleasing mixture of sound.
D.have smooth surfaces.
44.【题干】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 effectively as clouds.
45.【题干】The word "acoustic" in the last paragraph has something to do with_____
US Signs Global Tobacco Treaty【美国签订了全球烟草协议】
The United States has taken the first step toward approving a global tobacco treaty that promises to help control the deadly effects of tobacco use throughout the world. Health and Human Services Secretary Tommy Thompson signed the Framework Convention on Tobacco Control (FCTC) this week at the United Nations. ____(46)
The FCTC was developed by the World Health Organization and approved by members of the World Health Assembly，including the United States，last year. ______(47)
For instance, cigarettes sold in those countries would have to have health warnings on at least 30% of the front and back of every pack. _____(48) It also requires bans on tobacco advertising, though there are some exceptions for countries like the United States, where the Constitution prohibits such an outright ban.
______(49)The World Health Organization estimates that tobacco use kills nearly 5 million people worldwide every year. In the US alone, about 440,000 people die each year from tobacco-related illnesses; about one-third of all cancers in the US are caused by tobacco use. If current trends continue, WHO estimates, by 2025 tobacco will kill 10 million people each year.
The treaty must be ratified by at least 40 countries before it can take effect. ______(50)
A.Tobacco stocks also perked up as investors discounted fears of litigation(诉讼) from the US
B. So far，109 countries have signed it, and 12 have ratified it.
C. The impact of the treaty could be huge.
D. Countries that ratify(批准) it would be required to enact strict tobacco control policies.
E.The treaty calls for higher tobacco taxes, restrictions on smoking in public places, and more promotion of tobacco prevention and cessation programs.
F. The Senate must still approve the treaty before the US can implement its provisions.
Freezing to Death for Beauty
People in Beijing wear a lot of clothing during winter to fend off the cold. In the United States, however, people wear (51) ____ partly because the car is the primary mode of transportation. Cars take (52) _____ straight to their workplaces, which are heated well. The American diet is full of calories, so their (53) ____ can afford to burn heat more quickly.
Fewer layers of clothing give people the opportunity to stay (54) ______Lots of Yale girls wear skirts (55) ____ when it's 10 degrees Centigrade outside. Some of them at least wear boot, sights, and leg-warmers1.Some,however,really just go for the look (56) ____the risk of health2.These girls have nothing to prevent their legs (57) _____the wind, and no socks to protect their feet. A mini skirt and a pair of stilettos are all that they wear.
Typically, the ones pursuing fashion are (58) _____with little body fat. Just by the nature of their bodies, they are already at a disadvantage compared with normal people in (59) ____ weather. I have always (60) _____, whenever I pass these girls, how they manage to refrain from shivering and just smile like spring had arrived3.
And then there are the guys. The girls can be said to (61) _____health for beauty. But why do guys (62) _____ so little? It is not like, once they shed some layers, they suddenly become better-looking. They are not exactly being fashionable when they (63) _____wear sporty shorts and shower slippers in the midst of winter. It's not cute.
Of course, people have the freedom to look whatever (64) ____they want. I am just surprised that, given the vast difference between winter and summer temperatures in Connecticut, they can still (65) _____like they are partying on the beach in the middle of February.
51. A. scarce B. less C. little D. least
52. A. people B. students C. shoppers D. them
53. A. arms B. heads C. legs D. bodies
54. A. bony B. thin C. fashionable D. hungry
55. A. even B. sometimes C. frequently D. occasionally
56. A.in B. for C.at D. on
57. A. with B. against C. above D. under
58. A. fat B. ugly C. short D. skinny
59. A. warm B. cold C. cool D. hot
60. A. dreamed B. stated C. claimed D. wondered
61. A. sacrifice B. devote C. suffer D. endure
62. A. bear B. carry C. wear D. put on
63. A. only B. seldom C. rarely D. hardly
64. A. method B. road C. way D. avenue
65. A. see B. resemble C. show D. look
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