An uncommonly recognized source of global warming is from the agricultural industry. The rice paddies release methane which is one of the greenhouse gases. Fertilizers that are used for crops release another greenhouse gas, nitrous oxide.

　　Another reason is vaporization of water. The warmer the earth is, the more water that vaporizes from the oceans to clouds. These clouds can either increase the temperature or decrease it. The increased amount of vapor in the atmosphere will affect the earth's temperature but it is not completely known how.

　　31. The people in the world are over ________ now.

　　A．1 billion

　　B．2 billion

　　C．13 billion

　　D．6 billion

　　32. The burning of fossil fuels releases________．itrous oxide

　　33. Which of the following statements is not right?

　　A．Agricultural industry doesn't affect global warming.

　　B．These clouds can either increase the temperature or decrease it.

　　C．Burning trees releases the carbon dioxide into the atmosphere.

　　D．The growing population requires increasing amounts of energy.

　　34. The passage is mainly to tell about ________． the reasons of global warming

　　B．global warming

　　C．how to deal with the global warming

　　D．the population of the world

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