大学生自主学习主要表现在哪些方面？

公安机关的性质、任务决定了公安队伍必须保持政治坚定，站稳政治立场，把握正确方向。因此，始终把( )放在公安队伍建设的首位。

A．从严治警、依法治警
B．科教强警
C．从优待警
D．政治建警

阅读理解。

Mr.Wu: Good morning, Bruce.Sit down, please. May I ask you some questions? 

Bruce: Certainly. What do you want to know? 

Mr.Wu: First, when were you born,Bruce? 

Bruce: On June 22, 1990. 

Mr.Wu: Secondly, where were you born? 

Bruce: In Sydney, Australia. 

Mr.Wu: Where was your father born? 

Bruce: He was born in Sydney, too. 

Mr.Wu: When was he born? 

Bruce: Sorry, I don't know. But I know he's about forty years old. 

Mr.Wu: I see. What does your father do? 

Bruce: He's a doctor. He works in a hospital here. 

Mr.Wu: Is your mother working in China,too? 

Bruce: No, she works in Sydney. She's coming to China soon. 

Mr.Wu: Oh, that's very good. I have no more questions. Thank you, Bruce. 

Bruce: You're welcome, Mr.Wu.Good-bye. 

Mr.Wu: Good-bye. 

1. When was Bruce Born? 

    A. On July 22.

    B. In 1990.  

    C. In July.

    D. On June 23. 

2. Where was Bruce born? 

    A. In China.

    B. In Australia.  

    C. In America.

    D. In England. 

3. When was Bruce's father born?

    A. In 1964.

    B. In 1954.  

    C. In 1967.

    D. In 1957. 

4. What does his father do? 

    A. He's a worker. 

    B. He's a teacher. 

    C. He's a doctor.

    D. It doesn't tell us.

5. Where is Bruce's mother working now?

    A. In China.

    B. In Australia. 

    C. In America.

    D. In England.

根据合同法律制度的规定，债务人依据下列情形将标的物提存后，不需要履行通知义务的是（）。

A.债权人无正当理由拒绝受领

B.债权人下落不明

C.债权人死亡未确定继承人

D.债权人丧失民事行为能力未确定监护人

子宫脱垂Ⅲ度为________出 * * 口外。

执教人教版“长方形和正方形周长的计算”，一位数学教师制定如下教学目标：（i）掌握长方形和正方形周长的计算公式；C2）利用长方形和正方形周长的计算公式解决有关问题，培养学生运用知识解决实际问题的能力。你认为这一教学目标存在的主要问题是（）。

A.太过简单

B.太过复杂

C.空洞不明

D.期望过高