单项选择题

When did the technique of hearing test become standardized

A．Two years ago.
B．Three years ago.
C．Five years ago.
D．A decade ago.
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单项选择题
With all the data he needed ______, Peter began to write his thesis.
A．collecting
B．being collected
C．to be collected
D．collected
单项选择题
Although the model looks good on the surface, it will not bear close ______.
A．disposition
B．contamination
C．scrutiny
D．symmetry
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