8.Try to press the button twice and you can start the machine.
9.He recovered from his illness after two months in hospital.
10.Slowly,an image began to appear on the screen.
Ⅱ.拓展词汇
根据词性和汉语提示,写出下列单词
1.observe vt.观察;注意到→observer n.观察者→observation n.观察;观测;观察力
2.vary v.改变,不同→variety n.变化,多样化→various adj.不同的;有区别的→variation n.变化
3.concentrate vi.专注,专心→concentration n.集中;专心
4.shock v.震惊;使震动→shocked adj.感到震惊的,惊骇的→shocking adj.令人震惊的,可怕的
5.photograph n.照片 v.拍照→photographer摄影师
Ⅲ.补全短语
根据提示补全下列短语
1.brave the elements 不顾恶劣天气
2.in the wild 在野外
3.be famous for 因......而出名
4.be best known for 最是因......而出名
5.up to 多达
6.at a speed of 以......的速度
7.concentrate on 集中(注意力)于
8.recover from 从......苏醒过来
9.after all 毕竟;终究
10.from time to time 偶尔;不时地
Ⅳ.选词填空
选用上述短语的适当形式填空
1.Organizers expect up to 300,000 protesters to join the march.
2.I can't concentrate on my work when I'm tired.
3.He drove at a speed of sixty miles per hour.