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A.［3,+∞)                    B.［-3,+∞)

C.(-3,+∞)                            D.(-∞,-3)

函數f(x)=x³＋ax－2在區間(1,＋∞)內是增函數,則實數a的取值范圍是

A.［3,＋∞                                                   B.［－3,＋∞

C.(－3,＋∞)                                                   D.(－∞,－3)

A.［3,+∞)                      B.［-3,+∞)

C.(-3,+∞)                      D.(-∞,-3)