The outbreak was thought to have been started

A.purposefully.
B．accidentally.
C．on
B.
D．in
C.


【参考答案】

D
推断题。新闻指出，科学家们正在努力找出大肠杆菌爆发的根源，但是现在没有明确的，他们认为源头可以追溯到来自西班......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)