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单选题
（year>=25）？”teacher”：”student”这个条件表达式的意义是（）。
A
如果year大于或等于25，则表达式的值是teacher，否则为student
B
如果year 大于或等于25，则表达式的值是student，否则为teacher
C
如果year大于25，则表达式的值是teacher，否则为student
D
如果year小于或等于25，则表达式的值是teacher，否则为student
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