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( )
A.
减函数且f(0)>0
B.
增函数且f(0)>0
C.
减函数且f(0)<0
D.
增函数且f(0)<0
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【简答题】It is on his______ that Washington Irving’s fame mainly rested. A.childhood recollections B.sketches about his European tours C.early poetry D.tales about America