．

　　A．mainly because the levels of carbon dioxide are rising

　　B．partly due to changes in the output of solar energy

　　C．possibly because the ice caps in the poles are melting

　　D．only due to the effect of the inertia of the earth’s climate

　　49．On the basis of their models , scientists are of the opinion that

　　A．the climate of the world should be becoming cooler

　　B．the new Ice Age will be delayed by the greenhouse effect

　　C．the man．made warming effect helps to increase the solar effects

　　D．it will take thousands of years for the inertia of the earth’s climate to take effect

　　50．If the assumption about the delay of a flew ice, Age is correct ,

　　A．ice would soon cover the northern hemisphere

　　B．the greenhouse effect could work in favor of the earth

　　C．the best way to overcome the cooling effect would be to bum more fuels

　　D．the increased levels of carbon dioxide could warm up the earth even more quickly

　　B

　　When you want to see if a library has the book you want, you can use the catalogue (目录) in the library. Most catalogues of books in a library take the form of small cards kept in boxes. One way of arranging (排列) the cards is in ABC order by the family names of the writers.

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