A.He believes that the tests are good. B.He believes that the required test scores are too low. C.He believes that they are more important than academic preparation. D.He believes that the tests should not be used correctly.
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【单选题】已知函数y=ax和y=- b x 在(0,+∞)上都是减函数,则函数f(x)=bx+a在R上是( )