Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. 
Smoking is not allowed in the school. You _______________ smoke here.
A.might
B.must 
C. mustn’t                  
D.needn’t

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Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions
The days of the camera-toting tourist may be numbered. Insensitive travelers are being ordered to stop pointing their cameras and camcorders at reluctant local residents. Tour companies selling expensive trips to remote corners of the world, off the well-trodden path of the average tourist, have become increasingly irritated at the sight of the visitors upsetting locals. Now one such operator plans to ban clients from taking any photographic equipment on holidays. Julian Mathews is the director of Discovery Initiatives, a company that is working hand-in-hand with other organizations to offer holidays combining high adventure with working on environmental projects. His trips are not cheap; two weeks of white-water rafting and monitoring wildlife in Canada cost several thousand pounds.
 Matthews says he is providing 'holidays without guilt', insisting that Discovery Initiatives is not a tour operator but an environmental support company. Clients are referred to as 'participants' or 'ambassadors'. 'We see ourselves as the next step on from eco-tourism, which is merely a passive form. of sensitive travel - our approach is more proactive.'
 However, says Matthews, there is a price to pay. 'I am planning to introduce tours with a total ban on cameras and camcorders because of the damage they do to our relationships with local people. I have seen some horrendous things, such as a group of six tourists arriving at a remote village in the South American jungle, each with a video camera attached to their face. That sort of thing tears me up inside. Would you like somebody to come into your home and take a photo of you cooking? A camera is like a weapon; it puts up a barrier and you lose all the communication that comes through body language, which effectively means that the host communities are denied access to the so-called cultural exchange.'
 Matthews started organizing environmental holidays after a scientific expedition for young people. He subsequently founded Discovery Expeditions, which has helped support 13 projects worldwide. With the launch of Discovery Initiatives, he is placing a greater emphasis on adventure and fun, omitting in the brochure all references to scientific research. But his rules of conduct are strict. 'In some parts of the world, for instance, I tell people they should wear long trousers, not shorts, and wear a tie, when eating out. It may sound dictatorial, but I find one has a better experience if one is well dressed. I don't understand why people dress down when they go to other countries.'
 Matthews' views reflect a growing unease among some tour companies at the increasingly cavalier behaviour of well-heeled tourists. Chris Parrott, of Journey Latin America, says: 'We tell our clients that indigenous people are often shy about being photographed, but we certainly don't tell them not to take a camera. If they take pictures without asking, they may have tomatoes thrown at them.' He also reports that increasing numbers of clients are taking camcorders and pointing them indiscriminately at locals. He says: 'People with camcorders tend to be more intrusive than those with cameras, but there is a payoff - the people they are filming get a tremendous thrill from seeing themselves played back on the viewfinder.'
 Crispin Jones, of Exodus, the overland truck specialist, says: 'We don't have a policy but, should cameras cause offence, our tour leaders will make it quite clear that they cannot be used. Clients tend to do what they are told.
 Earthwatch, which pioneered the concept of proactive eco-tourism by sending paying volunteers to work on scientific projects around the world, does not ban cameras, but operates strict rules on their use. Ed Wilson, the marketing director of the company, says: 'We try to impress on people the common courtesy of getting permission before using their cameras, and one would hope that every tour operator would do the same. People have to be not only environmentally aware but also culturally aware. Some people use the camera as a barrier; it allows them to distance themselves from the reality of what they see. I would like to see tourists putting their cameras away for once, rather than trying to record everything they see.'
Which of the following does Chris Parrott believe?
A.Local people may react angrily towards tourists who use cameras
B.Tourists are becoming more sensitive about their use of cameras.
C.Camcorders always cause more trouble with local people than cameras
D.Tourists are unlikely to agree to travel without their cameras.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 26 to 32.
An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelt - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapour might be considered an air pollutant under certain conditions.
Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious chemicals in the air.
The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.
The word “adversely” in the first paragraph is closest in meaning to......
A.quickly
B.considerably
C.negatively
D.admittedly

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.
Earth is richly supplied with different types of living organisms which co-exist in their environments, forming complex, interrelated communities. Living organisms depend on one another for nutrients, shelter, and other benefits. The extinction of one species can set off a chain reaction that affects many other species, particularly if the loss occurs near the bottom of the food chain. For example, the extinction of a particular insect or plant might seem inconsequential. However, there may be fish or small animals that depend on that resource for foodstuffs. The loss can threaten the survival of these creatures and larger predators that prey upon them. Extinction can have a ripple effect that spreads throughout nature.
In addition to its biological consequences, extinction poses a moral dilemma for humans, the only species capable of saving the others. The presence of humans on the planet has affected all other life forms, particularly plants and animals. Human lifestyles have proven to be incompatible with the survival of some other species. Purposeful efforts have been made to eliminate animals that prey on people, livestock, crops, or pose any threat to human livelihoods. Some wild animals have been decimated by human desire for meat, hides, fur, or other body parts with commercial value. Likewise, demand for land, water, and other natural resources has left many wild plants and animals with little to no suitable habitat. Humans have also affected nature by introducing non-native species to local areas and producing pollutants having a negative impact on the environment. The combination of these human-related effects and natural obstacles such as disease or low birthrates has proven to be too much for some species to overcome. They have no chance of survival without human help.
As a result, societies have difficult choices to make about the amount of effort and money they are willing to spend to save imperiled species. Will people accept limits on their property rights, recreational activities, and means of livelihood to save a plant or an animal? Should saving such popular species as whales and dolphins take priority over saving obscure, annoying, or fearful species? Is it the responsibility of humans to save every kind of life form from disappearing, or is extinction an inevitable part of nature, in which the strong survive and the weak perish? These are some difficult questions that people face as they ponder the fate of other species living on this planet.
(Source: http://www.encyclopedia.com)
The word "inconsequential" in paragraph 1 is closest in meaning to             .
A.unrecognizable       
B.unavoidable            
C.unimportant            
D.unexpected