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．They saw something familiar to them.B．They saw something they had never seen.C．They considered her foolish.D．They considered her lazy.
A．They saw something familiar to them.
B．They saw something they had never seen.
C．They considered her foolish.
D．They considered her lazy.
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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