[单项选择]In the early 1930s, the American foreign policy was Isolationist, but the （　） suddenly changed the whole situation, which propelled the U.S. into the Second World War.
A. Pearl Harbor attack
B. bombing of Guam Island
C. seizing of American merchant ships
D. sinking of American passenger ships

[单项选择]My writing in my late teens and early adulthood was fashioned after the U.S. short stories and poetry taught in the high schools of the 1940s and 1950s, but by the 1960s, after I had gone to college and dropped out and served in the military, I began to develop topics and themes from my Native American background. The experience in my village of Deetziyamah and Acoma Pueblo was readily accessible. My mother was a potter of the well-known Acoma clayware. My father carved figures from wood and did beadwork. There was always some kind of artistic endeavor that Native American people, set themselves to, although they did not necessarily articulate it as "Art" in the sense of Western civilization. When I turned my attention to my own heritage, I did so because this was my identity, and I wanted to write about what that meant. My desire was to write about the integrity and dignity of a Native American identity, and at the same time I wanted to look at what this was within the context of an A
A. Literature can be a powerful tool for asserting the cultural values and political rights of ethnic groups.
B. The artistic traditions of Native American peoples are similar to those of European cultures.
C. All writings produced by Native Americans express, either directly or indirectly, a political position.
D. The major responsibility of Native American writers is to celebrate and preserve the cultural traditions of their peopl

[填空题]Most American people who adopt foreign-born children are not famous.

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Whether you are an American citizen or a foreign national living in the United States, travel abroad requires preparation. Travel may be for the purpose of attending meetings or activities in other countries, visiting families or simply taking a vacation. This page is intended to provide guidance and useful resources.
What information do U.S. citizens need
Depending upon the requirements of the country to be visited, citizens of the United States need to carry a passport that is valid for six months beyond the visit or documented evidence of their citizenship and identity (身份). In addition to a passport, some countries will require a visa. For more information, see Visa and Foreign Entry Requirements.
Current information on passports is available at the Department of State Passport Services and Information website. There is a new passport requirement for U.S. citizens traveling between the United States and the rest of the Western Hemisphere (半球). For deta
A. There is no limit to the validity of the passport.
B. The passport must be valid for half a year beyond the visit.
C. The citizen can apply for a passport as long as six months.
D. The minimum limit depends on the nature of the citizen’s visit.

[单项选择]During the 1920s and 1930s, （） was one of the fastest growing segments of the international tourism industry.
A. train tourism
B. coach tourism
C. cruise tourism
D. air tourism

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Since the 1930s, the idea that creatures might advertise their " fitness " as mates through symmetry has been around. It rests on the notion that factors ranging from bad genes to coming off worse in too many fights will lead to asymmetries others can see. And over the past few years, experiments with animals and humans seemed to support the idea that symmetry in features such as plumage and facial characteristics influences mate selection.
But no one had actually checked that the animals in these experiments can actually see the subtle differences in symmetry, typically of between 1 and 2 percent. Now the first such experiment has been carried out. The results are worrying for advocates of symmetry detection as a powerful factor in mate selection.
John Swaddle, an ethnologist at the University of Bristol, performed the experiment using wild starlings, which have excellent eyesight. He trained them to hit keys marked with bar patterns with varying levels
A. need symmetry detection
B. need complex three-dimensional images
C. begin to realize their dependence on symmetry
D. cannot be proved whether to rely on asymmetry