题目内容：
It can be inferred from the passage that the virus is transmitted from chimps in Cameroon to humans most probably through
A． some clades of the virus related to the human viru B． aborigines residing in the virgin forest of Cameroo
C． Ivory and hardwood traders who were bitten by the chimp
D． chimp droppings floating in a river from Southern Cameroon to Cong
参考答案：
答案解析：