若a>b,则2-a______2-b(填“>”,“=”,“<”)
不等式a>b的两边同时乘以-1,得-a<-b,
不等式-a<-b的两边同时加上2,得2-a<2-b.
— Will you stay for lunch?
— Sorry, _____. My sister is coming to see me. [ ]
A. I mustn't
B. I needn't
C. I can't
D. I won't
丁以其管理才能入伙是否有效