[不定项选择题]为预测我国居民家庭对电力的需求量，建立了我国居民家庭电力消耗量(单位：千瓦小时)与可支配收入(X1，单位：百元)、居住面积(X2，单位：平方米)的多元线性回归方程，如下 请根据上述结果，从下列备选答案中选出正确答案。 检验回归方程是否显著，正确的假设是（）。
A.H0：β1=β2=0；H1：β1≠β2≠0
B.H0：β1=β2≠0；H1：β1≠β2=0
C.H0：β1≠β2≠0；H1：β1=β2≠0
D.H0：β1=β2=0；H1：β1至少有一个不为零

[不定项选择题]为预测我国居民家庭对电力的需求量，建立了我国居民家庭电力消耗量(单位：千瓦小时)与可支配收入(X1，单位：百元)、居住面积(X2，单位：平方米)的多元线性回归方程，如下 请根据上述结果，从下列备选答案中选出正确答案。 回归系数β2=0．2562的经济意义为（）。
A.我国居民家庭居住面积每增加1平方米，居民家庭电力消耗量平均增加0．2562千瓦小时
B.在可支配收人不变的情况下，我国居民家庭居住面积每增加1平方米，居民家庭电力消耗量平均增加0．2562千瓦小时
C.在可支配收入不变的情况下，我国居民家庭居住面积每减少1平方米，居民家庭电力消耗量平均增加0．2562千瓦小时
D.我国居民家庭居住面积每增加1平方米，居民家庭电力消耗量平均减少0．2562千瓦小时

[不定项选择题]公路工程的消耗量中一般不作为工程造价编制依据的是（　）。
A.施工定额
B.预算定额
C.概算定额
D.估算指标

[不定项选择题]下列关于需求价格弹性的表述正确的有（　　）。 Ⅰ.需求价格弹性是指需求量对价格变动的反应程度 Ⅱ.价格和需求量是反方向变化 Ⅲ.需求价格弹性系数可能是正数 Ⅳ.需求价格点弹性等于需求量的无穷小的相对变化对价格的一个无穷小的相对变化的比 Ⅴ.需求价格弧弹性等于需求量的相对变动量对价格的相对变动量的比值
A.Ⅰ.Ⅱ.Ⅲ.Ⅴ
B.Ⅰ.Ⅱ.Ⅳ.Ⅴ
C.Ⅰ.Ⅱ.Ⅲ.Ⅳ
D.Ⅱ.Ⅲ.Ⅳ.Ⅴ

[不定项选择题]下动关于需求价格弹性的表述正确的有（ ）。 Ⅰ.需求价格弹性是指需求量对价格变动的反应程度 Ⅱ.价格和需求量是反方向变化 Ⅲ.需求价格弹性系数可能是正数 Ⅳ.需求价格点弹性等于需求量的无穷小的相对变化对价格的一个无穷小的相对变化的比 Ⅴ.需求价格弧弹性等于需求量的相对变动量对价格的相对变动量的比值
A.Ⅰ.Ⅱ.Ⅲ.Ⅳ
B.Ⅰ.Ⅱ.Ⅳ.Ⅴ
C.Ⅰ.Ⅱ.Ⅲ.Ⅳ
D.Ⅱ.Ⅲ.Ⅳ.Ⅴ

[不定项选择题]从我国的状况来看，形成一定时期内货币供应量超过客观需求量的基本原因包括（ ）。 Ⅰ.银行信贷原因 Ⅱ.国际收支原因 Ⅲ.市场融资原因 Ⅳ.国家财政原因 Ⅴ.国民经济结构原因
A.Ⅰ.Ⅱ.Ⅲ.Ⅳ.Ⅴ
B.Ⅰ.Ⅱ.Ⅳ.Ⅴ
C.Ⅰ.Ⅳ.Ⅴ
D.Ⅱ.Ⅲ.Ⅳ.Ⅴ

[不定项选择题]下列关于弹性的表达中，正确的有（　　）。 Ⅰ.需求价格弹性是需求量变动对价格变动的敏感程度 Ⅱ.需求价格弹性等于需求的变动量除以价格的变动量 Ⅲ.收入弹性描述的是收入与价格的关系 Ⅳ.收入弹性描述的是收入与需求量的关系 Ⅴ.交叉弹性就是一种商品的价格变化对另一种商品需求量的影响
A.Ⅰ.Ⅳ.Ⅴ
B.Ⅲ.Ⅳ.Ⅴ
C.Ⅰ.Ⅱ.Ⅲ
D.Ⅰ.Ⅱ.Ⅴ

[不定项选择题]下列关于弹性的表达中，正确的有（ ）。 Ⅰ.需求价格弹性是需求量变动对价格变动的敏感程度 Ⅱ.需求价格弹性等于需求的变动量除以价格的变动量 Ⅲ.收入弹性描述的是收入与价格的关系 Ⅳ.收入弹性描述的是收入与需求量的关系 Ⅴ.交叉弹性就是一种商品的价格变化对另一种商品需求量的影响
A.Ⅰ.Ⅳ.Ⅴ
B.Ⅰ.Ⅱ.Ⅲ
C.Ⅰ.Ⅲ.Ⅳ.Ⅴ
D.Ⅱ.Ⅲ.Ⅳ.Ⅴ

[不定项选择题]共用题干 American Dreams

There is a common response to America among foreign writers:the US is a land of
extremes where the best of things are just as easily found as the worst.This is a cliché（陈
词滥调）.
In the land of black and white,people should not be too surprised to find some of the
biggest gaps between the rich and the poor in the world.But the American Dream offers a
way out to everyone.________(1)No class system or government stands in the way.
Sadly,this old argument is no longer true.Over the past few decades there has been a fundamental shift in the structure of the American economy.
The gap between the rich and the poor has widened and widened.________(2)
Over the past 25 years the median US family income has gone up 18 percent.For the
top 1 percent,however,it has gone up 200 percent.Twenty-five years ago the top fifth
of Americans had an average income 6.7 times that of the bottom fifth.________
(3)
Inequalities have grown worse in different regions.In California,incomes for lower
class families have fallen by 4 percent since 1969.________(4)This has led to an
economy hugely in favor of a small group of very rich Americans.The wealthiest 1 percent
of households now control a third of the national wealth.There are now 37 million
Americans living in poverty.At 12.7 percent of the population,it is the highest percentage
in the developed world.
Yet the tax burden on America's rich is falling,not growing.________(5)There
was an economic theory holding that the rich spending more would benefit everyone as a
whole.But clearly that theory has not worked in reality. ________（5）
A.Nobody is poor in the US.
B.The top 0. 01 percent of households has seen its tax bite fall by a full 25 percentage points since 1980.
C.For upper class families they have risen 41 percent.
D.Now it is9.8 times.
E.As it does so,the possibility to cross that gap gets smaller and smaller.
F.All one has to do is to work hard and climb the ladder towards the top.