![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
A.There was a long interval between cause and effect.B.The weather was difficult for u
A.There was a long interval between cause and effect.
B.The weather was difficult for us to forecast.
C.Weather forecast was inaccurate.
D.Ecologists didn't appear until modern times.
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)