因为4（x-8）=4x-4×8，
4×8-8，
=32-8，
=24．
故结果比原来少24．
故选C．
You _____ wash your hands before meals. It is good for your health. [ ]
A. may
B. can
C. have to
D. must
资本资产定价模型(CAPM)中的贝塔系数测度的是()。
A.汇率风险
B.操作风险
C.系统性风险
D.利率风险
