睡眠时的主要脑电图波形是（）A．ɑ波 B．β波 C．θ波 D．γ波 E．δ波

花生是一种我们喜欢吃的食品．食用花生时，我们常剥掉被称为“麻屋子”的外壳，发育成“麻屋子”的结构是（　　）

A．珠被

B．子房壁

C．胚珠和子房壁

D．受精卵

如图所示，用半径为0.4m的电动滚轮在长薄铁板上表面压轧一道浅槽。薄铁板的长为2.8m、质量为10kg。已知滚轮与铁板与铁板工作台面间的动摩擦因数分别为0.3和0.1。铁板从一端放入工作台的砂轮下，工作时砂轮对铁板产生恒定的竖直向下的压力为100N，在砂轮的摩擦作用下铁板由静止向前运动并被压轧出一浅槽。已知滚轮转动的角速度恒为5rad/s。

（1）通过分析计算，说明铁板将如何运动，

（2）加工一快铁板需要多少时间，

（3）加工一快铁板电动机要消耗多少电能。（不考虑电动机自身的能耗）

《职业病报告办法》规定，尘肺病患者死亡后，由死者所在单位填写《尘肺病报告卡》，在()日内报所在地的卫生监督机构。

A.7

B.15

C.20

D.30

I was with a group of businessmen, and we were dealing with a question—What is a good person?

At a certain point during the discussion, one of the students—a young man of about thirty—described an event that happened at Christmas. He and his five-year-old son were decorating the Christmas tree, and a little boy came to the front door begging. If you ever visit Mexico, you will see that the people there take begging as nothing to get upset about and nothing to get embarrassed by.

So, this little boy came to the door, a boy about the same age as my student’s son. The father and the son went to the front door, and the father went back with his five-year-old son and said to him, “Give him one of your toys.” At the words, the little boy quickly picked up some toy, and his father said to him, “No, no－give him your favorite toy.”

And the little boy, like a little tiger, said, “No way!” He cried; he refused. But the father, like a big tiger in a way, insisted gently, “No, you must give him one of your favorite toys.”

And finally the boy, with his head down, picked up a toy he had just gotten. The father waited in the living room, and the boy walked to the front door with the toy in his hand. The father waited and waited.

What do you think happened?

After a couple of minutes, his son came running back into the living room, his face radiant (喜气洋洋). “Daddy,” he said, “can I do that again?”

I think I have got the answer to the question.

小题1:From the passage, we can learn that in Mexico ________.

A．begging is looked down upon

B．begging is considered as a normal part of life

C．visitors all over the world treat beggars kindly

D．few people are living a poor life小题2:The sentence “can I do that again?” showed that the boy ________.

A．got pleasure by helping the little beggar

B．wanted to please his father

C．began to like the little beggar

D．wanted to be the little beggar’s friend小题3:According to the writer, being a good person means ________.

A．having the courage to correct his/her mistakes

B．being friendly to beggars

C．being ready to give

D．being able to teach children to tell right from wrong

对行政管理有决定性影响的社会环境是( )。

A．政治法律环境
B．精神文化环境
C．物质经济环境
D．历史人口环境