机械加工中，轴类零件常用（）或（）作为定位基准。

过点(p，sinp)作曲线y=sinx的切线，设该曲线与切线及y轴所围成的面积为S₁，曲线与直线x=P及x轴所围成的面积为S₂，则（）。

A.

B.

C.

D.

下列各句，没有语病、句意明确的一项是  [ ]

A．关于当下子女的教育问题，绝大多数家长都认识到如果不适当地管教孩子必定对孩子的成长不利。

B．实行阶梯式电价，一方面是调节用电量，起到节能减排合理用电的目的；另一方面，则是要保证低收入群体用电价格不提高。

C．当代表委员审议和讨论政府工作报告时，他们可能没想到“两会”不仅成为国际社会“观察中国内政外交的风向标”，也被认为是“观察国际经济形势的一个重要风向标”。

D．在某种程度上，一部京剧史也是众多艺术流派形成、孕育、涌兴、流布的历史，而传承贯穿着各个流派发生和发展的整个历程。

（）以其可靠性、灵活性、人机界面友好性和通信的方便性等特点已被广泛应用。

A.简单控制系统

B.串级控制系统

C.集散控制系统

D.常规控制系统

伸直型肱骨髁上骨折可出现（）

A．肱动脉损伤

B．腘动脉损伤

C．尺神经损伤

D．桡神经损伤

E．股骨头缺血性坏死

阅读理解。

Dear editor,

     I read with interest the article on American families. In general I agree with it, but there are some important

things it left out. It didn't tell the reader much about the life of a househusband. It's not an easy life. I know,

because I'm now a househusband myself. A househusband has to change many of his ideas and his ways.

     First of all, he has to change the way he thinks about time. Before I was a househusband, I worked full-time

for the New York Times. I was a reporter, and time was always important. Everyone was always in a hurry.

     However, it's different at home. The househusband cannot be in a hurry all the time. If you rush around,

you will make everyone unhappy because they don't understand. For them, time is not important. So you have

to learn to slow down. That is the first and most important rule for a househusband.

     What's more, there is something else the househusband must learn. You must learn to show how you feel

about things. Many men do not know how to talk about their anger, worries, or love. But children need to know

how much you love them. If you are angry, they need to know why. So does your wife. If you do not say

anything, your family may get the wrong idea. Then there may be serious problems.

     People talk a lot about househusbands these days. Usually they talk about men doing the housework, the

cooking, cleaning, and shopping. But in my opinion, these are the easiest things to learn. It is much harder for

me to change the way I think and the way I act with my family. I think other men will also find this harder,

but, like me, will find it necessary if they want to have a happy family! 

                                                                                                                             Ted Diamond

                                                                                                                             Hartwell, New Jersey

1. The text is mainly about ____.

A. fathers and children

B. life as a househusband

C. ideas about time

D. American families

2. Family problems can occur if ____.

A. men get wrong ideas about something

B. men talk too much with their families

C. men don't talk enough with their families

D. people talk a lot about househusbands

3. Ted thinks ____.

A. learning about housework is easy

B. learning about housework is a problem

C. being a househusband is an easy task

D. cooking is the easiest thing to learn

4. How is the text developed?

A.  B.  C.  D.

(① = paragraph l; ② = paragraph 2; ③ = paragraph 3;

④ =paragraph 4; ⑤ = paragraph 5)