Period 7　Assessment 

　　Knowledge aims:

　　Key words in this unit: engine, characteristic, radium, theory, scientific, examine, conclude, analyze, repeat, defeat, attend, expose, cure, control, absorb, severe, valuable, blame, immediately, handle, announce, instruct, virus, construction, contribute, positive, movement, backward, complete, enthusiastic, spin, reject, view.

　　Key phrases in this unit: put forward, know about, look into, in addition, prevent sth. from doing, lead to, make sense, punish sb.for, suggest doing sth. steam engine, draw a conclusion, link...to..., be strict with, lead to, point of view.

　　Key sentence patterns:

　　1 But he became inspired when he thought about helping ordinary people exposed to cholera.

　　2 He got interested in two theories explaining how cholera killed people.

　　3 Only if you put the sun there did the movements of the other planets in the sky make sense.

　　Grammar in this unit:

　　Past participle used as attribute and predicative

　　Ability aims:

1.To talk about great scientists and their great achievements.