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【单选题】
What is the real relationship between education and economic development? We have to suspect that continuing economic growth promotes the development of education even when governments don't force it. After all, that's how education got started. When our ancestors were hunters and gatherers 10,000 years ago, they didn't have time to wonder much about anything besides finding food. Only when humanity began to get its food in a more productive way was there time for other things. The author quotes the example of our ancestorsto showthat education emerged ______.
A.
when people had enough time
B.
prior to better ways of finding food
C.
when people on longer went hungry
D.
as a result of pressure on government
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【判断题】重点调查是指在调查对象总体中有意识地选择一些具有代表性的单位进行专门调查。()
A.
正确
B.
错误
【判断题】重点调查是指在调查对象总体中有意识地选择一些具有代表性的单位进行专门调查。
A.
正确
B.
错误
【判断题】对于所有的零级反应来说,反应速率常数均为零。(    )
A.
正确
B.
错误
【判断题】由于中国自古没有宗教体系,所以古代的君王不具备宗教功能。()
A.
正确
B.
错误
【单选题】()是指在调查对象总体中有意识地选择一些具有典型意义或者具有代表性的样本进行专门调查。
A.
市场普查
B.
重点调查
C.
典型调查
D.
抽样调查
【判断题】对于所有的零级反应来说,反应速率常数均为零。 ( )
A.
正确
B.
错误
【判断题】对于所有的零级反应来说,反应速率常数均为零。 ( )
A.
正确
B.
错误
【简答题】解方程 ①(x-2) 2 -25=0 ②2x 2 -4x-1=0(配方法) ③3(x-2) 2 =x(x-2) ④(3x+1)(x-2)=10.
【单选题】根式 2x-8 有意义的条件是(  )
A.
x≤4
B.
x≥4
C.
x<4
D.
x>4
【单选题】如果 2x-4 是二次根式,那么x应满足的条件是(  )
A.
x≥0
B.
x≥2
C.
x>2
D.
x>4
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