3) dinosaurs, dodo, ...

Step Four: Language points

1. as a result 结果；因此 （放在句首或句中，用逗号与句子其它部分隔开,常用在有上下文表示原因的情况下）

eg. He was lazy. As a result, he was late for school. 他懒。结果，他上学迟到了。

△ as a / the result of + n. 由于...的结果（表示因果关系）

eg. As a result of his laziness, he was late for school.

△ result in 导致；造成...的后果

(vi.)

e.g. His laziness resulted in his being late for school.

△ result from 因...引起；起因于

eg. His being late for school resulted from his laziness.

2. die out : disappear completely 灭绝

eg. Many animals have died out in the past. 在过去几年间，许多动物都灭绝了。

△ die away 慢慢消失

eg. He hid behind the door until the footsteps had died away.

他一直躲在门后边，直到脚步声（完全）消失。

3. endanger vt. 危害

eg. Smoking endangers your health. 吸烟危害健康。

△endangered adj. 濒危的 （动词的过去分词做形容词）

endangered wildlife 濒危野生动物

*动词的-ing形式和过去分词都可以做形容词。

surprising / surprised; exciting / excited; interesting / interested;

frightening /frightened; etc.

4. in peace 和平地；安祥地 （=peacefully）

5. (be) in danger 在危险中；垂危

(be) out of danger 脱离危险

eg. The tiger is in danger now. Let's help it, or it won't be out of danger.

现在老虎处于危险中。我们帮帮它吧，否则它不会脱离危险的。