4．We learned from the book that the Earth ______ round．（　�。�
A．isB．wasC．were

分析 我們從書中學到地球是圓的．

解答 答案：A，考查系動詞．句意"我們從書中學到地球是圓的．"is是；was是is的過去式；were是are的過去式．根據(jù)題干We learned from the book that the Earth ______ round．可知我們從書中學到地球是圓的．真理不變的事實要用一般現(xiàn)在時，不必考慮前面的時態(tài)．故選A．

點評 分析句子的結(jié)構(gòu)，根據(jù)句子的內(nèi)容，了解一些固定用法，讓后作答．

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