有关生物监测，正确的说法是（）

A.为了发现有效的生物标志物

B.可以代表外接触量，特别是经呼吸道接触量

C.不能反应机体总的接触量和负荷

D.可用于筛检易感者

E.生物效应剂量是表示吸收到体内毒物的量

The Chamberlain's Men, in Shakespeare's time, were a remarkable group of people-excellent______who were also business partners and close personal friends.

A．actors

B．students

C．teachers

D．writers