单项选择题


A．alters
B．varies
C．shifts
D．changes
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单项选择题
A．involvedB．participatedC．attendedD．employed
A．involved
B．participated
C．attended
D．employed
单项选择题
A．definitionsB．identificationC．functionsD．operations
A．definitions
B．identification
C．functions
D．operations
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