下列表述正确的是（）。A.流动资产周转率越高，流动资产利用效果越好 B.总资产周转率

读下列材料，回答问题。

材料一：

下图是北京近地面多年平均气温分布图（单位：℃）和北京城市环流模式图。

    2008年8月举行的第29届奥运会，被称为“绿色奥运、人文奥运、科技奥运”，使中国在世界中的威望大大提高。此次奥运会之所以受到如此高的评价，与北京市大力开展环境治理、大搞植树造林活动密不可分。

（1）观察上图，说出北京市近地面多年平均气温分布状况是____________________________________，

     产生这种状况的原因是________________________________________________________________。（2）用箭头画出北京市的热岛环流示意图。

（3）根据城市热岛环流的特点，北京市规划的造林重点应选在图中A、B、C三地中的______地，其对北

    京市环境治理的主要作用是_____________________________________________。

（4）北京市要把大气污染严重的某大型企业从城区迁出。根据城市热岛环流的特点，最适合该企业的新

    厂址应选在图中的A、B、C三地中的______地，该新厂址对北京市环境保护的主要意义是__________

    _____________________________________________________________________________________。

下列实验室制取气体的方法中，可行的是（　　）

A．燃烧木炭制取二氧化碳

B．加热氯酸钾和少量高锰酸钾的混合物制取氧气

C．稀硫酸跟石灰石反应制取二氧化碳

D．稀硫酸跟铜反应制取氢气

人造地球卫星可在高度不同的轨道上运转，已知地球质量为M,半径为R,表面重力加速度为g，万有引力恒量为G，则下述关于人造地球卫星的判断正确的是

A．所有绕地球做匀速圆周运动的人造地球卫星的运行周期都应小于

B．所有绕地球做匀速圆周运动的人造地球卫星的运行速度都不超过

C．若卫星轨道为圆形，则该圆形的圆心必定与地心重合

D．地球同步卫星可相对地面静止在广州的正上空

An eight-year-old child heard her parents talking about her little brother. All she knew was that he was very sick and they had no money left. When she heard her daddy say to her (1) mother," (2) a miracle can save him now", the little girl went to her bedroom and took out her piggy bank. She (3) all the change out on the floor and counted it carefully. Then she (4) her way six blocks to the drugstore.

"And what do you want" asked the shopkeeper. "It’s (5) my little brother," the girl answered back. "He’s really, really sick and I want to buy a (6) . His name is Andrew and he has something (7) growing inside his head and my daddy says only a miracle can save him. " "We don’t (8) miracles here, child. I’m sorry." the chemist said, smiling (9) at the little girl.

In the shop was a (10) customer. He stooped down and asked the little girl, "What kind of miracle does your brother (11) " "I don’t know," she replied. "He’s really sick and mommy says he needs (12) . But my daddy can’t pay for it, so I have brought my (13) .""How much do you have" asked the man. "One dollar and eleven cents, (14) I can try and get some more," she answered quietly. "Well, what a coincidence," smiled the man. "A dollar and eleven cents—the (15) price of a miracle for little brothers. (16) me to where you live. I want to see your brother and (17) your parents. "

That well-dressed man was Dr Carlton Armp, a doctor. The operation was completed without any (18) and it wasn’t long before Andrew was (19) again. The little girl was happy. She knew exactly how much the miracle cost—one dollar and eleven cents—also the (20) of a little child.

15（）

A．same

B．exact

C．proper

D．necessary

计算题：一管材延伸系数λ为4.78，拉伸前外径为28mm，壁厚为0.9mm，试计算该管材拉伸后的面积？