【单选题】When economists use the term "ceteris paribus," they mean that:
A.
the causal relationship between two economic variables cannot be determineD.
B.
the analysis is true for the individual but not for the economy as a whole.
C.
all other variables except the ones specified are assumed to be constant.
D.
their conclusions are based on normative rather than positive economic analysis.
【单选题】When economists measure economic growth, they often use:
B.
the unemployment rate.
【单选题】患儿,男,10个月,家长带其到儿科生长发育门诊体检,体重9.1kg,身长75cm,乳牙4颗,前囟1cm×1cm,家长担心发育不正常。医生告知家长正常小儿前囟闭合的年龄是
【单选题】When economists are trying to help improve the world they are
A.
concerned with positive economics.
【多选题】(多选题)以下属于中国四大园林的是( )。