单项选择题

A．Three Americans.
B．Three Frenchman.
C．One American.
D．We don’t know exactly.
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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.
单项选择题
A．A new dependence on people far away and money.B．The introduction of a new alphabet and numerical system.C．Necessity of fanning and hunting.D．Large family units and money problems.
A．A new dependence on people far away and money.
B．The introduction of a new alphabet and numerical system.
C．Necessity of fanning and hunting.
D．Large family units and money problems.
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