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.
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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．They can easily catch fire.B．They can be easily operated.C．They are not as safe as gas balloons.D．They cost too much money.
A．They can easily catch fire.
B．They can be easily operated.
C．They are not as safe as gas balloons.
D．They cost too much money.
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