Until the start of the Industrial Revolution, mankind was poor, hungry, and constantly at the _____ of disease

and natural disasters. [ ]

A. power

B. limit

C. control

D. mercy

确定乳腺肿块性质最可靠的方法是（）

A. * * 触诊

B. * * 溢液涂片

C. * * 钼靶X线检查

D.B超

E.活组织病理检查