一、复习

Level3-Unit2-Part1*Learning-

 Listening-"Test Results"-D17-18/06/22

二、学习-L3-U3

Level3-Unit3-Part1*Learning-

 Listening-"Life & Conditions 1"

1、There are many forms of life on Earth, including human beings.

2、Some forms of life live in a watery environment, like the oceans.

3、Other forms of life can be found in very dry areas like deserts.

4、However, for any form of life to exist, conditions must be right.

5、This event happened over a period of several million years.

6、Conditions must be right for life to exist.

7、Some scientists believe that there were several causes.

8、Scientists are working to better understand what really happened.

9、This was the largest extinction event of all time.

10、The causes of this extinction event are still unknown.

11、Possible causes include large volcanic eruptions and global warming.

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12、Life exists in a variety of conditions.

13、Millions of years ago there were forms of life that no longer exist.

14、Ninety six percent of all life in the oceans died out.

15、To become extinct means to die out completely.

16、They believe that a series of events caused the extinctions.

17、One extinction event happened about 250 million years ago.

18、In nature, even small changes can sometimes have large effects.

19、When conditions are not right, that form of life will become extinct.

20、Without enough sunlight, plants and plant-eating animals quickly died.