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【多选题】
下列规律正确的有()。A.
盈亏临界点不变，销量越大，实现的利润越多或亏损越少
B.
销量不变，盈亏临界点越低，实现的利润越少或亏损越多
C.
销售单价、单位变动成本一定，固定成本越高，盈亏临界点越低
D.
成本水平一定的情况下，盈亏临界点受产品单位售价变动的影响
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【简答题】social mobility
【单选题】What does the former Labour MP mean by saying 'social mobility created falters as well as risers' in Paragraph Four?
A.
Social mobility was a 'two-way street' and 'a zero-sum game'.
B.
All students from comprehensive school can reach the Oxford by hard work.
C.
School dropouts always work with lower payments.
D.
Social mobility was a mirror to constant efforts from different people.
【单选题】What is this passage mainly concerned?
A.
Education fund needs social mobility.
B.
Education needs new policy and reform.
C.
Children pay more premiums in schools, so there are difficulties in their lives.
D.
Children were recruited from disadvantaged backgrounds, so they are very poor.
【单选题】A _____ is a less rigid form of social stratification in which social mobility is possible.
A.
caste system
B.
normative system
C.
religious system
D.
class system
【判断题】The concept of social mobility refers to changes in people’s positions in the social hierarchy.
A.
正确
B.
错误
【简答题】Social mobility is the extent to which _____________ can move out of the strata into which they are born.
【单选题】What is strongly correlated with social mobility according to economist Raj Cherty? 查看材料
A.
Family structure．
B.
Racial equality．
C.
School education．
D.
Community density．
【单选题】What might be the best title for this passage?
A.
Social Upward Mobility.
B.
Incredible Income Gains.
C.
Inequality in Wealth.
D.
America. Not Land of Opportunity.
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