单项选择题

A．The various means of survival taught by parents.
B．The importance of history instruction in schools.
C．The different skills taught in schools.
D．The problems involved in the building of new schools.
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单项选择题
A．Three Americans.B．Three Frenchman.C．One American.D．We don’t know exactly.
A．Three Americans.
B．Three Frenchman.
C．One American.
D．We don’t know exactly.
单项选择题
A．The hydrochloric acid broke the carbon bonds in the carbon dioxide,B．The magnesium oxide broke the carbon oxygen bonds in the carbon dioxide.C．The burning magnesium broke the carbon oxygen bonds in the carbon dioxide.D．The gas collection method broke the carbon - oxygen bonds in the carbon dioxide.
A．The hydrochloric acid broke the carbon bonds in the carbon dioxide,
B．The magnesium oxide broke the carbon oxygen bonds in the carbon dioxide.
C．The burning magnesium broke the carbon oxygen bonds in the carbon dioxide.
D．The gas collection method broke the carbon - oxygen bonds in the carbon dioxide.
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