Level3 Unit3 Part1-1 Listening Life & Conditions 1

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

Life exists in a variety of conditions.√

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

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

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

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

To become extinct means to die out completely.√

听选：what must be right for life to exists? - Conditions must be right forlife to exists.

听选：what happened  -

听选：What is one form of life on Earth?- Human beings are one form of life on Earth.

填空：Life exists in a variety of conditions.

填空：However, for any form of life to exist, conditions must be right.

排序：There are many forms of life on Earth, including human beings. Some forms of life live in a watery environment, like the oceans. Other forms of life can be found in very dry areas like deserts. However, for any form of life to exist, conditions must be right.

Conditions must be right for life to exist. Millions of years ago there were forms of life that no longer exist.

When conditions changed, these forms of life dead out.√

One extinction event happened about 250 million years ago. √

This was the largest extinction event of all time.√

Many forms of life became extinct. √

96%(Ninety six percent) of all life in the oceans died out.√

Most insects also became extinct.√

This event happened over a period of several million years.√

听选：What happened about 250 million years ago?- One extinction event happened about 250 million years ago. Many forms of life became extinct.

听选：what happened in the extinction event? -Many forms of life became extinct.

听选：What causes an extinction event?- The conditions that support life change.

填空： Conditions must be right for life to exist.

填空：This event happened over a period of several million years.

填空：Conditions must be right for life to exist .

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

The causes of this extinction event are still unknown.

Possible causes induced large volcanic eruptions and global warming.

Some scientists believe that there were several causes.

They believe that a series of events caused the extinctions.√

Scientists are working to better understand what really happened.√

听选：What is unknown about the large extinction event？ -  The causes of this extinction event are still unknown.

听选：What is one possible cause of this event?- Possible causes induced large volcanic eruptions and global warming.

听选：What do some scientists think caused the extinctions? - Some scientists believe that there were several causes.

填空：Scientists are working to better understand what really happened.

填空：The causes of this extinction event are still unknown.

听说：Life exists in a variety of conditions.

听说：Conditions must be right for life to exist.

听说：Some scientists believe that there were several causes.

听说：Ninety six percent of all life in the oceans died out.

听说：This was the largest extinction event all time.

看说： Other forms of life can be found in very dry areas like deserts.

看说： The causes of this extinction event are still unknown.

看说：Some forms of life live in a watery environment, like the oceans.

看说：Possible causes induced large volcanic eruptions and global warming.