Water On Earth

Most of the Earth’s water is in the oceans. 

The two largest oceans are the Pacific and Atlantic Oceans.

Unfortunately, we can’t drink ocean water. 

This is because ocean water has too much salt. 

Fortunately, there is also water in lakes and rivers. 

This water isn’t salty, so we can drink it. 

Only about 2% of the world’s water is fresh water. 

Without fresh drinking water, we can’t live. 

A person can’t live for more than a few days without water.

Exercises:

1.where is most of the earth's water?

in the oceans.

2.besides the oceans ,where else is the world's water?

in lakes and rivers 

3.A person can’t live for more than a few days without water.

4.This water isn’t salty, so we can drink it. 

5.This is because ocean water has too much salt. 

Rivers are important. 

Most rivers begin in mountains and end in the oceans. 

The water flows from high ground to low ground. 

At first, rivers are small and are called creeks or streams.

ps:起初，河流很小，被称为小溪或小溪。

At first最初;起初;开始时

rivers河; 江; 涌流; river的复数

small小的; 小号的，小型的; 成为小块; 小小地; 后腰; 小件衣服

called叫做; 称作; 给…命名; 称呼; 把…叫做; 认为…是; 把…看作; 把自己称为; 自诩; call的过去分词和过去式

creeks小海湾; 小港湾; 小河; 小溪; creek的复数

streams小河; 溪; 流; 流动; 流出; 鱼贯而行; 一个接一个地移动; 飘动; 飘扬; stream的第三人称单数和复数

As water enters from other streams, a river grows. 

Exercises:

1.what do most rivers end?

end in the oceans.

2.As water enters from other streams, a river grows. 

Some rivers become very large and long. 

The longest river in the world is the Nile River, in Africa. 

It’s almost 6,500 kilometers long. 

As for water volume, the Amazon is the largest river. 

ps:至于水量，亚马逊河是最大的河流。

As for至于，就…方面说来; 至于，关于

water水; 大片的水; 水域; 江，河，湖，海; 给…浇水; 灌溉; 充满眼泪; 流口水

volume体积; 容积; 容量; 量; 额; 音量; 响度

Amazon亚马孙族女战士; 悍蚁

largest大的; 大规模的; 大量的; 大型号的; 广泛的; 众多的; large的最高级

river河; 江; 涌流

The volume of water flowing through it per second is more than in any other river.

Exercises:

1.what is the world's largest river by volume?

As for water volume, the Amazon is the largest river. 

2.As for water volume, the Amazon is the largest river. 

Another use of rivers is for energy. 

The energy of falling water is used to produce electricity. 

This use of water supplies over 20% of the world’s electricity. 

Rivers are also important for agriculture. 

Without water, farmers cannot grow food. 

And of course rivers can be used for transportation. 

River boats are used to carry things to inland cities or lakes.

ps:内河船用来把东西运到内陆城市或湖泊。

boats小船; 汽艇; 舟; 船; boat的复数

used to曾经

carry拿; 提; 搬; 扛; 背; 抱; 运送; 携带; 佩戴; 输送，传输，传送

inland向内陆; 向内地; 内陆的; 内地的

cities都市; 城市; 特许市; 特权市; city的复数

lakes湖; 湖泊; lake的复数

Exercises:

1.what is another use of rivers?

 produce electricity.

2.The energy of falling water is used to produce electricity. 

3.The water flows from high ground to low ground. 

4.Most rivers begin in mountains and end in the oceans. 

5.River boats are used to carry things to inland cities or lakes.