若函数f（x）=x3-ax2-x+6在（0，1）内单调递减，则实数a的取值范围是

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问题选择题

若函数f（x）=x³-ax²-x+6在（0，1）内单调递减，则实数a的取值范围是[ ]

A.a≥1

B.a=1

C.a≤1

D.0＜a＜1

答案

答案：A

填空题

老作家巴金在80年代写的散文集的名字是（）。

单项选择题

The implication in this passage is that ______

A．only a German physicist could discover such a theory

B．quantum theory, which led to the development of twentieth century physics, is basically a mathematical formula

C．Planck's constant was not discernible before 1900

D．radiation was hard to study