How were Frank and I connected()

A.My grandmother and his grandmother were sisters.

B.We were first cousins once removed.

C.We were second cousins once removed.

D.My great-grandmother and his great-grandmother were sisters.

某外源性化学物质的蓄积系数K>5时，表明该物质的蓄积毒性为（）。

A.高度蓄积

B.明显蓄积

C.中等蓄积

D.低度蓄积

E.无蓄积