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¡¡¡¡61.All of the atoms of an element contain the same number of protons in their muclei£¬¡¡and the atoms of one element differ from those of all other elements in the number of protons so contained.

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¡¡¡¡62.The kinds of evidence for the roundness of the world that led finally to its general accep¡¡tance included such data as the shape of the shadow of the earth on the moon during an eclipse of the¡¡moon£¬the fact that as one sails from port on a ship the building of the port gradually seem to sink¡¡below the surface of the water£¬and£¬most convincing£¬the fact that it is possible to sail all around¡¡the world and return to the starting point of the voyage.

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¡¡¡¡63.The technological breakthrough and the lndustrial Revolution brought with them a mastery of food production and control of infectious disease that reduced the normal death-rate to below 1.5 per cent.

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¡¡¡¡64.There are a few specially designed homes that are heated primarily by the sun but there is no practical and economic means for converting solar energy directly into that great convenience£¬electricity.

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¡¡¡¡65.A balance consists of an arlTl balanced at its middle£¬¡¡with known weights hung on one hand and the object whose weight is to be found on the other.

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