材料一：单极是持久的，也是和平的。最大的危险是美国的行动太少。作为一个拥有无可争议的优势的国家，美国比任何国家更有可能轻视这一国际系统和总的挑战。但由于这一系统是围绕美国建立起来的，这就要求美国进行约束和管理，美国对挑战的反应及提出的法令越有效，这一系统将越长久和越稳定。

——(美)威廉·沃尔弗斯《稳定的单极世界》(1999年)

材料二：“冷战”结束后，世界向多极化的方向发展，但多极化格局的形成需要经历相当长的时期，其间会充满各种政治力量之间的激烈斗争。世界各种力量正在进行新的分化组合。美国成为唯一的超级大国，欧盟、日本、俄罗斯、中国几大力量也相对突出，广大发展中国家整体实力增强。

根据汉语意思完成句子

    Everything about me elephant is big, from its size to how long it takes for a baby elephant to be born. Of all land animals, the elephants have the ____ (large) brain and can talk to each other using their own language. They also have ____ very good memory. They can remember lots of other elephants that they have known and have friends and family the same way humans do. They will get very sad ____ one dies and they help family members when they are sick or hurt.

    In India and Africa they ____ (use) for transportation and to carry tourists around animal parks. Elephants are different ____ many other animals because they are very kind and care about humans. They are gentle and kind and don't hurt anyone. They will only fight to protect ____ (they). There is a story of an ____ (India) king who died and for over 30 years his favourite elephant was very sad and would not do anything.

    And how do we humans treat elephants? For ____ (thousand) of years elephants have been treated very ____ (bad) and killed by humans. Although there is an international agreement to stop the ivory (象牙) from being sold, people still shoot and kill elephants to get their tusks. In fact, in 20 years there might not be any elephant left on Earth. So it is important for us ____ (save) the elephants before it's too late.