由于信息具有( )的特点，就要求信息流经处理的道路最短，而且中间的停顿最少。
A．及时性
B．有序性
C．可存储性
D．时效性
参考答案：D
. It is said that in Australia there is more land than the government knows _______.
A．it what to do with
B．what to do it with
C．what to do with it
D．to do what with it
力的单位是[ ]
A．G
B．N
C．kg
D．mm
