单项选择题

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单项选择题
Specific schedule revisions for which of the following facilities are listed in this announcement
A．Athletic and recreational.
B．Food and transportation.
C．Bookstore and post office.
D．Medical and audio-visual.
单项选择题
It is believed that a new technique to ______ will probably be found.
A．recycle old aluminum products
B．discover more bauxite ores
C．make aluminum by putting ore particles under water
D．take out aluminum magnetically from poorer ores
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