It is well known to all that the kilogram is the international         of weight.
A．positionB．conditionC．conference D．standard
D

試題分析：句意為：眾所周之公斤是國(guó)際重量標(biāo)準(zhǔn)。position：位置 ，condition：條件， conference：會(huì)議， standard：標(biāo)準(zhǔn)。根據(jù)語(yǔ)境可知應(yīng)選D。
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