Natural sites and historic buildings,when left alone,can slowly be in bad condition.____For these reasons we must protect them.

    “World Heritage" is the title given to places chosen from natural sites and buildings around the world. These places are considered special,valuable and require protection. They may be places of nature or cultural heritages that are the pride of the people in the country____ Each is a treasure of our planet that must be protected for us and our future generations.

    Even extremely beautiful natural environments can be in bad condition if they are left alone____For instance,the Galapagos Islands are now protected by rules that stop people from bringing or removing plants and animals to or from the islands, moving rocks and touching the animals. In the US,people are not allowed to visit Grand Canyon National Park by vehicle. It aims to protect the park's environment from the gas produced by cars____ Australia is making stricter laws to prevent agricultural chemicals from flowing into the ocean near the Great Barrier Reef. Efforts are also being made to protect Natural Heritage sites in Japan. In Shiretoko,only a small number of people are allowed to walk on its nature path at the same time____

A. They may also be home to endangered species（物种）．

B. Today there are 183 Natural Heritage sites around the world.

C. People can change these places too,just as the wind and rain can.

D. Natural Heritage is valued for geographical characteristics and beautiful scenery.

E. That's why measures are being taken around the world to protect them.

F. It can reduce the risk of people accidentally stepping on valuable plants.

G. There are even security guards there who can arrest people that break the rules.

下列叙述中，因我国人口数量过多而带来的负面影响是（     ）

阅读材料，回答问题：周平王即位，把都城迁到洛邑，以避开犬戎族的进攻。平王时期，周王室势力已经衰弱，诸侯以强并弱，齐、楚、晋等开始强大起来，政权也由地方诸侯掌握。

    Today's workplace is unique in history.Never before have we seen people working together who represent such different backgrounds and experiences.This difference of age,race,gender,and work style makes it very difficult to organize and run a company.

    As a result,companies are looking for individuals who can manage a wide range of employees effectively. Increasingly,managers are discovering that age differences among workers are a major cause of concern.

    This has been an important realization.The management difficulties and challenges have led some experts to study intergenerational differences for an understanding of problems in the workplace.What they have discovered is interesting and may provide ways of improving working conditions in companies that employ individuals from different generations.

    The first thing to realize,they say,is that differences of opinion about the importance of work and how to get work done are not a coincidence.That is,it is not an accident that young employees will be different from older employees.In fact,if employers do not pay attention to these differences,it is possible that anger will build up between people and lead to difficulties in the company.

    Resentment（仇恨）between members of different generations,if not attended to（处理）,can lead to extreme anger and unhappiness and even lasting enmity if people are not careful.That individuals from different generations should come to view each other as if they were from different sides of warring countries should not be surprising.

    It is natural for individuals from the same generation to form alliances（联盟）,to come together for protection. Different generations represent different experiences in life,and these lead naturally to different opinions about oneself and one's approaches to work.

    If you were raised in a time of plenty,when products were readily available and relatively inexpensive,you would believe that prosperity is natural and expectable.If,on the other hand,you were raised in a time of scarcity,you would always be careful not to waste things for fear you would not have enough.You would make angry people who seem to believe that problems will always solve themselves.Such optimism in the face of difficulties would be a source of unhappiness between you and them.It is difficult,in such circumstances,to achieve a happy,agreeable atmosphere in the workplace.