The rapid increase in greenhouse gases is making the world warmer. The worlds temperature has already gone up by half a degree this century， and the sea level has risen by ten centimeters. If the amount of carbon dioxide in the atmosphere doubles， there will probably be a rise in the earths temperature of between 1~ and 4~. This may seem a small increase， but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded， and some regions would become dry and unable to produce crops. It is important， too， to consider that there maybe a delay of about thirty years in the greenhouse effect. This means that we are probably experiencing only now the effect of the gases put into the atmosphere up to the 1960s. Since then， our use of these gases has greatly increased.

　　41 According to the passage， a greenhouse is built to

　　A keep the plants warm.

　　B prevent air pollution.

　　C stop the greenhouse effect.

　　D produce useful gases.

　　42 Without the greenhouse gases， the earth would

　　A become warmer.

　　B be much colder.

　　C move more slowly.

　　D move quickly.

　　43 A major cause of the increase in the greenhouse gases is

　　A the burning of trees and crops.

　　B the building of many greenhouses.

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