单项选择题

Common cold ______ neither age nor sex.

A．saves
B．covers
C．spares
D．causes
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单项选择题
It is essential that all the details in this case ______ first.
A．is investigated
B．was investigated
C．be investigated
D．shall be investigated
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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