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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单项选择题
None of the soldiers was allowed to open fire unless heavy loss was shown to be ______ inevitable.
A．nonetheless
B．otherwise
C．hence
D．therefore
单项选择题
By lip reading or watching the movements of the speaker's lips, a deaf person can actually see ______ the person at the other telephone is saying.
A．that
B．how
C．what
D．where
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