英语流利说-Level5·Unit3·Part4-Dictation

Dictation

Be careful about investing.

One of my best friends became an investor after he sold some stock in the company he was working for.

He's really smart, but he got fooled into investing a lot of money into a company that went bankrupt.

He ended up losing his entire investment.

Living conditions around the world vary.

Some countries have very large economies, but the majority of their citizens are poor.

Other countries have smaller economies, but the majority of their citizens are NOT poor.

So the size of a country's economy isn't the only factor that determines how wealthy its citizens are.

So the process begins by breathing in air, which happens when the lungs expand and draw in air.

Once inside the lungs, oxygen in the air is exchanged for carbon dioxide in the blood.

This exchange happens when blood cells release carbon dioxide and absorb oxygen.

This blood is now oxygenated blood, which means it carries oxygen.