单项选择题


A．discovered
B．disclosed
C．invented
D．revealed
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单项选择题
A．distinguishedB．dividedC．dissolvedD．removed
A．distinguished
B．divided
C．dissolved
D．removed
单项选择题
A．extensiveB．sophisticatedC．advancedD．significant
A．extensive
B．sophisticated
C．advanced
D．significant
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