1．Dark matter gives out no light and only because of its gravity effect on visible matter ________ see its existence．（　�。�
A．does everyoneB．everyone doesC．does nobodyD．nobody does

分析 暗物質(zhì)不發(fā)光，只是因為他對于發(fā)光物體的重力效應(yīng)我們每個人才能看到它的存在．

解答 答案：A．
本句考查only加介詞短語位于句首后面的主句用部分倒裝結(jié)構(gòu)的用法．because of its gravity effect on visible matter 為一介詞短語做原因狀語，所以后面的句子用部分倒裝，可排除B和D，結(jié)合句意，應(yīng)該是每個人都能看到這一暗物質(zhì)的存在；故選A．

點評 對于倒裝句型要熟悉這一基本結(jié)構(gòu)，即Only+狀語或者狀語從句+部分倒裝的主句．

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