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问题 选择题

将体积相同的实心铁块和木块（ρ木＜ρ水）放入足够深的水中后（　　）

A．铁块和木块受到的浮力相等

B．铁块受到的浮力比木块受到的浮力大

C．铁块受到的浮力等于重力

D．木块受到的浮力大于重力

答案

体积相同的铁块与木块，铁块质量大于木块质量，木块漂浮浮力等于自身重力，故D错误，

铁块下沉，浮力小于铁块重力，故C错误，

铁块完全浸没，排开水的体积大于木块排开水的体积，所以铁块所受浮力大，故A错误，B正确．

故选B．

单项选择题

统计最基本的职能是（）。

A.信息职能

B.咨询职能

C.监督职能

D.预测职能
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填空题

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 are
This 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.
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