All kinds of meat，the scientists reported，are harder on the planet than vegetables.To grow and eat a pound of potatoes，for example，sends less than one quarter pound of carbon dioxide into the air.So shifting our diet to less meat and more vegetables may do the world some good.

　　36．The text mainly tells us ________.

　　A．what we eat can affect the whole planet

　　B．the way we live affects the environment

　　C．how we can save energy on the Earth

　　D．how we can produce environment­friendly food

　　37．What is likely to happen if the climate is getting warmer according to the passage?A．Sea level will continue to rise sharply.

　　B．Human beings won’t have enough food.

　　C．It would be very hard for man to survive.

　　D．All the animals and plants will disappear.

　　38．Why does the author mention the process of making a hamburger?

　　A．To show meat is usually part of a hamburger.

　　B．To illustrate that our food contributes to greenhouse gases.

　　C．To prove making a hamburger is a complex process.

　　D．To suggest a lot of energy is needed to make hamburgers.

　　39．The author believes one effective way to fight global warming is ________.

　　A．we should eat no pork and no chicken

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