Ⅰ.Teaching aims and demands
1. main vocabularies: conclude, analyze, defeat, expert, attend, cure, challenge, absorb, suspect, enquiry, blame, pollute, handle, announce, contribute, reject, cautious.
2.phrases: put forward, draw a conclusion, expose...to..., apart from，link...to..., (be) strict with, make sense.
Ⅱ.main and difficult points
1. put forward, apart from, contribute...to, make sense
2. ①It seemed that the water was to blame.
②Neither its cause nor its cure was understood.
Ⅲ.Teaching methods
discussion, pair work, role-play, team work.
