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The percentage of immigrants (including th

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The percentage of immigrants (including those unlawfully present) in the United States has been creeping upward for years. At 12.6 percent, it is now higher than at any point since the mid 1920s. We are not about to go back to the days when Congress openly worried about inferior races polluting America’s bloodstream. But once again we are wondering whether we have too many of the wrong sort of newcomers. Their loudest cites argue that the new wave of immigrants cannot, and indeed do not want to, fit in as previous generations did.

We now know that these racist views were wrong. In time, Italians, Romanians and members of other so called inferior races became exemplary Americans and contributed greatly, in ways too numerous to detail, to the building of this magnificent nation. There is no reason why these new immigrants should not have the same success.

Although children of Mexican immigrants do better, in terms of educational and professional attainment, than their parents, UCLA sociologist Edward Telles has found that the gains don’t continue. Indeed, the fourth generation is marginally worse off than the third. James Jackson, of the University of Michigan, has found a similar rend among black Caribbean immigrants, Telles fears that Mexican Americans may be fated to follow in the footsteps of American blacks—that large parts of the community may become mired in a seemingly state of poverty and underachievement. Like African Americans, Mexican Americans are increasingly relegated to (降入) segregated, substandard schools, and their dropout rate is the highest for any ethnic group in the country.

We have learned much about the foolish idea of excluding people on the presumption of the ethnic/racial inferiority. But what we have not yet learned is how to make the process of Americanization work for all. I am not talking about requiring people to learn English or to adopt American ways; those things happen pretty much on their own, but as arguments about immigration hear up the campaign trail, we also ought to ask some broader question about assimilation, about how to ensure that people, once outsiders, don’t forever remain marginalized within these shores.

That is a much larger question than what should happen with undocumented workers, or how best to secure the border, and it is one that affects not only newcomers but groups that have been here for generations. It will have more impact on our future than where we decide to set the admissions bar for the latest ware of would be Americans. And it would be nice if we finally got the answer right.

What does Edward Telles research say about Mexican Americans()

A.They may slowly improve from generation to generation.

B.They will do better in terms of educational attainment.

C.They will melt into the African American community.

D.They may forever remain poor and underachieving.

答案:

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     This was the conclusion of a team of scientists from China's State Forestry Administration and the

World Nature Fund.

     The South China tiger, also known as the Chinese tiger, is native to southern China. In the 1950's, there were over 4000 tigers found in mountain forests in the country. But due to the destruction of their natural

habitat and uncontrolled hunting, it has been pushed on to the list of the world's top ten most endangered

species.

     Sixty-six of the big cats can be found in the cages of a dozen zoos around China. But they are nothing

like their wild cousins. They have lost their natural skills such as hunting and killing. If they were set free

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     "Breeding has damaged the quality of the species", said Pei Enle, deputy director of the Shanghai Zoo.

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tigers to South Africa. Four of them have already arrived. Progress has been made as two elder tigers have recovered some of their instincts(本能)and can hunt wild animals by themselves at the African base.

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Research and Development Center. " We tried in Fujian Province, but it was not successful as there was

not a complete eco-chain(生物链) and there was a lack of space. "

     The tigers should return to China in 2007 when the reservations in Fujian are ready.

1. What is the main reason for the South China tiger becoming one of the world's top ten most endangered species?

A. Because it has lost its natural instincts.

B. Because there is not a complete eco-chain.

C. Because there is no space for it.

D. Because uncontrolled hunting has destroyed its natural living conditions.

2. How is the programme of sending several tigers to South Africa getting on?

A. Its effect still remains to be seen.

B. Two tigers can already compete with their wild cousins.

C. Some of the tigers are already on the road to recovering their natural skills.

D. The tigers should be able to recover their instincts completely by 2007.

3. By saying " but they are nothing like their wild cousins", the writer means that ______.

A. they are no longer feared by other wild animals

B. they don't know how to hunt or kill

C. a complete change has resulted in the species because of breeding

D. to reintroduce them into the wild has become an urgent task

4. What is the purpose of sending young tigers to South Africa?

A. To help the tigers recover their ability to live in the wild.

B. To provide them with a better environment.

C. To get the tigers to go on a tour.

D. To find a complete eco-chain for them.

5. Which one is not the reason for South Africa being chosen as the training place?

A. Because the tigers can hunt wild animals by themselves at the African base.

B. Because South Africans are skilled at dealing with the tigers.

C. Because there is a complete eco-chain and enough space there.

D. Because the country has good natural conditions for the tigers to learn in.  

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题型:单项选择题

Most IP layer-based proxy mechanisms, such as network address translation (NAT), only support uni-directional proxy, from the internal network to external network (the Internet). The proxy establishes the communication channel by (86) IP addresses. The IP addresses must be (87) . These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels, such as, multimedia applications. IP layer-based proxy mechanisms need additional software (88) for each application that uses (89) channels. SOCKS identifies communication targets through domain names, overcoming the restriction of using private IP addresses. SOCKS can use domain names to establish communication between separate LANs, with (90) IP addresses.

(90)是()

A.duplicating

B.crossing

C.overlapping

D.repeating

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