3．We have taken effective measuresto preserve（preserve）our natural resources．

分析 我們已經(jīng)采取了有效措施保護我們的自然資源．

解答 答案是to preserve．本題考查語境中選用所給詞的恰當(dāng)形式； preserve vt．保護；題干中考查短語take measures  to do sth．采取措施做…，故答案是to preserve．

點評 本題是要求用所給詞的適當(dāng)形式填空，解題時首先根據(jù)句子的結(jié)構(gòu)考慮句中需要的詞性；其次，關(guān)注所選詞的形式的變化：如果是謂語動詞關(guān)注時態(tài)、語態(tài)和數(shù)的變化；如果是非謂語動詞要聯(lián)系非謂語的基本用法判斷非謂語的形式．如果是名詞關(guān)注單數(shù)和復(fù)數(shù)的選用等．

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