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1£®What's the main idea of the text?

A£®Copernicus' revolutionary theory and his contribution to the field of astronomy.

B£®The earth was not the centre of the solar system.

C£®The history of astronomy.

D£®Copernicus—a great scientist.

2£®(1)Para.1¡¡¡¡                   A£®New observations didn't agree with the

                                   old theory about the earth.

(2)Para.2                          B£®Copernicus' theory is the basis of

                                   modern science about the universe.

(3)Para.3                          C£®Copernicus was puzzled  as he found

                                   the earth was not the centre of the solar

                                   system.

(4)Para.4                          D£®Copernicus' new theory  that the sun

                                   was the centre could explain all the

                                   phenomena.

(5)Para.5                          E£®Copernicus improved his  theory by

                                   collecting observations and using his

                                   mathematical knowledge.

[´ð°¸]¡¡1.A¡¡2.(1)£­(5)CAEDB