下列少数民族名称中哪些是解放后改称的？（）A.朝鲜族 B.俄罗斯族 C.佤族 D.壮

东西半球的划分界线是______．

一同学在使用打点计时器时，纸带上点不是圆点而是一些短线，这可能的原因是[ ]

A.接在直流电源上

B.电源电压不稳

C.电源频率不稳

D.打点针压得过紧

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中由两项为多余选项。

­­­­­­­­­­­小题1:-----------------------

When we speak of a basic human need we mean something necessary to life, something we cannot do without. Food is a basic human need. Without it we would starve to death. Whether in primitive(原始的)countries or in more advanced societies, man’s food needs are the same. 小题2:

But primitive people eat only the food which can be grown near their homes, whereas people in more advanced societies eat food which is often grown many thousands of miles away from their homes. Primitive people are satisfied with less kinds of food, therefore we can say people’s wants are different although their needs are the same.

小题3:Clothing is necessary to regulate (调节) the heat of our bodies. In different climates and in different seasons we need more or less clothes. We also dress differently for other reasons. 小题4:

Shelter, the third of our needs, depends on climate, the skill of the builders, one’s social position, and the material which can be used. 小题5:The three-bed-roomed house of the average family would not be grand enough for a very rich family, but a modern house with many of the material comforts were denied to the kings and queens in the past.

A．Food, Clothing and Shelter.

B．Human Needs

C．We always change our style of clothing for different occasions, such as work, sports, parties.

D．We all need food to live a healthy life.E. We want to live comfortably .

F. The simple shelter of the primitive people would not do for us, and yet it satisfied their needs.

G. The same is true of the second of human needs.

在近年来发生的地震灾害中，被摧毁的房屋中属于豆腐渣工程的屡见不鲜，主要原因有（）。

A.不按标准施工

B.偷工减料

C.局部构件抗震能力不足

D.地震震级太大

生物滤池底板坡度应采用（）倾向排水渠，并有冲洗底部排水渠的措施。

A.0.005

B.0.01

C.0.02

D.0.03