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牙龈失去食物生理性按摩作用，引起牙龈废用性萎缩是因
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从上颌侧切牙的远中逐渐转向后端，使前牙所联成的牙列较圆，这种牙列的形态是（）
In 1921, Franklin Roosevelt took his family sailing one day and he fell overboard into the chilly waters. The next day, a forest fire broke out. Franklin and his children helped to fight the forest fire and put it out. It was hard and tiring work. After the fire was out, Franklin was sick. It was polio. He could not move his legs. The doctors said he could never walk again.Many men would have given up then. Franklin Roosevelt did not give up. He began to work to get well again. Even though he could not get out of bed, he did exercises, and his shoulders and arms grew very strong. At last the doctors let him out of bed, but he had to wear heavy metal braces on his legs. Then he went to Warm Springs, Georgia. He swam in the warm waters there. Even though it was painful to move his legs, he kept on swimming and exercising them. He grew better until he could leave the braces off. He could walk with only a cane to help him."The only thing we have to fear is fear itself, "President Roosevelt told the people. He kept ().
案例分析题The Culture Debate in the US:Whose Culture Is This ,Anyway美国的文化辩论：空间是谁的文化？Part of the debate about culture revolves around issues of perspective and ownership. Within a nation such (1) the United States—a nation whose cultural heritage includes elements from every corner of the world (2) are a great many perspectives coexisting and intertwining in the cultural fabriC．When we all ask (3) as individuals, "what belongs to me, to my culture" we are rewarded with a spectacular variety of (4) ; in this way, different perspectives and ownership of different cultural traditions enriches everyone. But when we ask " (5) belongs to us, to our culture" we ask a much harder question. Do the people of the (6) States, or of any culturally complex human society, necessarily share common cultural elements If so, who gets (7) decide what those elements areThis debate is a crucial one in many cultures throughout the world (8) . In the US, the debate promises to impact the way we educate our children—that is, (9) manner and shape in which culture reproduces itself—and the way we write our laws. In (10) countries, equally crucial issues are at stake.For many people, what is at stake is the character (11) US national identity. Hirsch argues that this identity needs to become less culturally fragmented; others, like Walker, (12) that the national character gets its strength from cultural diversity, from the freedom (at home and in (13) ) to celebrate, honor, and reproduce different cultural traditions. Those who take this latter view follow the reasoning (14) Shweder, arguing that we need to accept that there are multiple valid cultural perspectives and that two (15) perspectives can both be valid even though they might contradict one another.Recognize that the position you (16) in this debate about culture—whatever position you take—is a political one with implications (17) what we should value, what we should praise, what we should accept, what we should teach. When (18) reflect on this debate, when you contribute your own voice to the discussion, try to be (19) of the implications that follow from your position. When you listen to the voices of others, try to (20) with awareness, deciding for yourself what is at stake and how their positions relate to your own. （20）处填入（）
Questions 11 to 18 are based on the conversation you have just heard.
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