客观地反映某一时点的疾病分布以及人群的某些特征与疾病之间的联系，不设专门对照，使用的

玲玲学习完美国居民后得出如下结论，你认为不正确的是[ ]

A．美国是个移民国家，人口分布不均          

B．亚洲移民的后裔最多，有色人种主要是黄种人

C．美国的土著居民是印第安人，数量已不多    

D．华人和华侨为美国的繁荣做出了巨大贡献

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　 　 Industrial pollution is not only a problem for the countries of Europe and North America but also an extremely serious problem in some developing countries.小题1:They want to introduce industries, and so they put few controls on the industries which cause pollution.

　 　 Cubatao, an industrial town of 85 000 people in Brazil, is an example of the connection between industrial development and pollution. In 1954, Cubatao had no industry.小题2:　The people of the town are suffering from the poisonous matter in their environment．小题3:Birth shortcomings are extremely common. Among children and adults, lung problems are sometimes twelve times more common in Cubatao than in other places.

　　　小题4:However,  these laws are not strict enough. It is cheaper for companies to take no notice of the laws and pay the fines(罚款) than to buy the expensive equipment that will reduce the pollution. It is clear, therefore, that economic growth is more important to the government than to the health of the workers.

　　　However, the responsibility does not completely lie with the Brazilian government. 小题5:A number of the factories in the town are owned by large companies from France, Italy, and the U. S. They are doing things in Brazil that they would not be able to do at home. If they caused the same amount of pollution at home, they would be severely punished or even put out of business.

A．So the bad effects can be clearly seen.

B．It is true that Brazil has laws against pollution,

C．For these countries, economic growth is a very important aim.

D．The pollution in Cubatao is caused by the changes of the companiess.Ｅ．The government should play an important role in controlling pollution.

Ｆ．Today it has more than twenty large factories, which produce many pollutants(污染物)．

Ｇ．The example of Cubatao shows that international companies are not acting in a responsible way either.

新中国成立后，为巩固人民 * * 进行的斗争有

①抗美援朝②开国大典③土地改革④三大改造⑤镇反运动[ ]

A．①②③

B．①③⑤

C．②③④

D．①③④

对照集客专线SLA级别或合同要求、网络设计资料、拓扑，对专线全程路由安全性进行梳理，对AAA级专线要求全程具备自愈保护能力，客户接入段要求网络具备（）。

A.物理双路由保护

B.逻辑双路由保护

C.物理单路由保护

D.逻辑单路由保护