单项选择题

Plants can absorb the carbon dioxide through their ______ during the sunlight hours and produce oxygen which human beings need to survive.

A．slots
B．hoses
C．pores
D．sponges
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单项选择题
Although her marriage was very unhappy, Mrs. Stephens remained with her husband for the ______ of the children.
A．reason
B．sake
C．care
D．convenience
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