The environmental practices of big businesses are shaped by a fundamental fact that offends our sense of justice.A business may maximize the amount of money it makes by damaging the environment and hurting people.When government regulation is effective，and the public is environmentally aware，environmentally clean big businesses may out-compete dirty ones，but the reverse is likely to be true if government regulation is ineffective and the public doesn't care.
   It is easy to blame a business for helping itself by hurting other people.But blaming alone is unlikely to produce change.It ignores the fact that businesses are not charities but profit-making companies，and they are under obligation to maximize profits for shareholders by legal means.
   Our blaming of businesses also ignores the ultimate responsibility of the public for creating the conditions that let a business profit through destructive environmental policies.In the long run，it is the public，either directly or through its politicians，that has the power to make such destructive policies unprofitable and illegal，and to make sustainable environmental policies profitable.
   The public can do that by accusing businesses of harming jye.aim.The public may also make their opinion felt by choosing to buy sustainably harvested products；by preferring their governments to award valuable contracts to businesses with a good environmental track record；and by pressing their governments to pass and enforce laws and regulations requiring good environmental practices.
   In turn，big businesses can exert powerful pressure on any suppliers that might ignore public or government pressure.For instance，after the US public became concerned about the spread of a disease，transmitted to humans through infected meat，the US government introduced rules demanding that the meat industry abandon practices associated with the risk of the disease spreading.But the meat packers refused to follow these，claiming that they would be too expensive to obey.However，when a fast-food company made the same demands after customer purchases of its hamburgers dropped，the meat industry followed immediately.The public's task is therefore to identify which links inthe supply chain are sensitive to public pressure.
   Some readers may be disappointed or outraged that I place the ultimate responsibility for business practices harming the public on the public itself.I also believe that the public must accept the necessity for higher prices for products to cover the added costs of sound environmental practices.My views may seem to ignore the belief that businesses should act in accordance with moral principles even if this leads to a reduction in their profits.But I think we have to recognize that，throughout human history，government regulation has arisen precisely because it was found that not only did moral principles need to be made explicit，they also needed to be enforced.
   My conclusion is not a moralistic one about who is right or wrong，admirable or selfish.I believe that changes in public attitudes are essential for changes in businesses' environmental practices.

（1）The main idea of Paragraph 3 is that environmental damage

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A．is the result of ignorance of the public
B．requires political action if it is to be stopped
C．can be prevented by the action of ordinary people
D．can only be stopped by educating business leaders
（2）In Paragraph 4，the writer describes ways in which the public can

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D

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A．reduce their own individual impact on the environment
B．learn more about the impact of business on the environment
C．raise awareness of the effects of specific environmental disasters
D．influence the environmental policies of businesses and governments
（3）What pressure was given by big business in the case of the disease mentioned in Paragraph 5？

C

C

A．Meat packers stopped supplying hamburgers to fast-food chains.
B．Meat packers persuaded the government to reduce their expenses.
C．A fast-food company forced their meat suppliers to follow the law.
D．A fast-food company encouraged the government to introduce regulations.
（4）What would be the best heading for this passage？

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D

A．Will the world survive the threat caused by big businesses？
B．How can big businesses be encouraged to be less driven by profit？
C．What environmental dangers are caused by the greed of businesses？
D．Are big businesses to blame for the damage they cause to the environment？