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Read the passage and answer the questions that follow on the basis of the information provided in the passage.

An aggressive publicist of the Scientific Revolution and one of its greatest contributors was a Florentine, Galileo, informed of a new optical instrument developed in the Netherlands, the telescope, constructed one for himself and turned it toward the heavens. Through the lens of the fantastic instrument he was the first human being to see that Jupiter and moons like the earth's, and that the earth's own moon was made of material similar to that found on earth. The momentous conclusion was that heavenly bodies wee not made of more perfect material.

Rather, they resembled the earth and were governed by the same laws. Galileo's conclusions were equally revolutionary when he turned to consider the behavior of bodies in motion. Traditional theories of dynamics, geared to the assumption that the natural state of a body was at rest, attempted to explain what caused motion to occur. For Galileo, there was no "natural" motion of the body; rather, if a body was in motion, it would continue in a straight line at the same speed forever unless deflected, quickened, or retarded by another force"illustrating the principle of inertia. Thus what concerned Galileo was not why things move but why changes in motion occur and how one describes these changes mathematically.

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Qs.2/3: What is the main ides of this passage?

AGalileo built on the work of Copernicus and Kepler

BGalileo built his own telescope

CGalileo made revolutionary discoveries

DGalileo discovered that Jupiter had moons

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