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标准离差率也称变异系数，是指______同______的比值；标准离差是反映随机变量离散程度的一个指标，它只能用来比较______相同的项目的风险程度。
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【简答题】简述BPR的含义。
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【单选题】_____ you are supposed to do _____ you don’t like a thing is changing it．Don’t complain．
A.
That; what
B.
When; that
C.
What; since
D.
What; when
【单选题】_____is widely known that you value more what you haven’t rather than what you have .
A.
As
B.
What
C.
It
D.
Which
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