环境的不确定性可以从两个角度来衡量。一是环境的（）。二是环境的（）。
A.复杂性
B.广泛性
C.多变性
D.多样性
参考答案：A, D
Have you heard ________ news? The price of ________ petrol is going up again!
A. the; the
B. /; the
C. the; /
D. /; /
Prince William, marrying Kate Middleton, has become a public again.
A．reputation
B．figure
C．attention
D．character
of ________ petrol is going up again!