题目

_____ excited the whole nation most is _____ more than 100 workers who were trapped under the coal mine in north China have been rescued. A. It; that     B. That; whether    C. What; whether    D. What; that 答案：D 若f(x)=-(x-2)2+bln x在(1,+∞)上是减函数,则b的取值范围是(　) (A)[-1,+∞) (B)(-1,+∞) (C)(-∞,-1] (D)(-∞,-1)