零的绝对值是（） A．0； B．；1 C．正数； D．负数.

假定通过对股票过去价格的分析，投资者得到以下观察现象。其中，( )与有效市场假定的弱有效性形型相抵触。

A．平均收益率远远大于零

B．某一周的收益率与其下一周的收益率之间的相关系数为零

C．在股票价格上涨10%以后买进，然后在股价下跌10%后卖出，能够取得超额收益

D．持有期分红率较低的股票能够取得超过平均水平的资本利得

B 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 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.

重事式领导方式

患者甲输液中发生反应，经对症处置，症状消失，当天夜里出现心悸、呼吸困难，晨5时死亡。家属认为是医院的责任，拒不从病房移走尸体。第二天上午上班，院方决定请法医钱某做尸检。下午钱某告知院方因紧急会务不能去做，家属也不同意尸检，第三天又请到法医李某，经与家属协商，第四天进行了尸检，李某未能对死因做出解释。使纠纷无法下结论，对这一结果（）

A.钱某承担因拖延而迟延尸检，无法下结论的结果

B.只能以死因不明定论

C.李某承担因未做出解释而无法结论的结果

D.院方承担因请人不当而无法结论的结果

E.家属承担因不同意尸检迟延尸检而无法结论的结果

下列关于视杆细胞的描述，错误的是（）

A.数量较多

B.对光敏感度较高

C.无色觉

D.分辨能力较低

E.主要在昼光下起作用