单项选择题


A．on the surface
B．at the surface
C．on surface
D．at surface
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单项选择题
A．knownB．definedC．calledD．referred to
A．known
B．defined
C．called
D．referred to
单项选择题
A．in a wordB．in the meantimeC．in other wordsD．in that case
A．in a word
B．in the meantime
C．in other words
D．in that case
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