Tom is only three years old, so he _____.[ ]

A.  can't look at him    

B.  isn't able to look him after

C.  can't to look after him    

D.  isn't able to look after him

从谋求市场竞争优势角度而言，（）指标最具基础性的决定意义。

A.净资产收益率

B.财务资本保值增值率

C.核心业务资产销售率

D.营业现金流量比率