1．Our main aim isto discourage（ discourage） young people from smoking．

分析 我們的主要目的是勸阻年輕人吸煙．

解答 答案是to discourage．本題考查語境中選用所給詞的適當(dāng)形式．discourage sb．from doing sth．勸阻某人做…；題干中需要的是動詞不定式做表語，表達(dá)目的．故答案是to discourage．

點評 本題是要求用所給動詞的適當(dāng)形式填空，解題時首先考慮句中需要的是謂語動詞還是非謂語動詞；其次，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．

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