Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years，including the last Ice Age．The problem is that

　　the models are predicting that the world should be entering a new Ice Age and it is not．One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia(惰性)of the earth’s climate．If this is right，the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun’s fading heat．

　　46．It can be concluded that a concentration of carbon dioxide in the atmosphere would

　　．

　　A．mean a warming-up in the Arctic

　　B．raise the temperature of the earth’s surface

　　C．prevent the sun’s rays from reaching the earth’s surface

　　D．explain the cause of great changes in the climate in the northern hemisphere

　　47．The article was written to explain

　　A．the greenhouse effect

　　B．the solar effects on the earth

　　C．the causes affecting weather

　　D．the models of solar weather interactions

　　48．Although the fuel consumption is greater in the northern hemisphere．temperatures there seem

　　to befalling．This is

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