20．You needn't be frightened because these insects are completelyharmless（harm）．

分析 你不必害怕因為這些昆蟲完全是無害的．

解答 答案：harmless 根據(jù)關(guān)鍵部分You needn't be frightened 并結(jié)合給出的提示詞harm，可知只有在這些昆蟲沒有害的情況下才會沒有必要害怕，所以這里應(yīng)該用與harm有關(guān)的表否定意義的形容詞harmless，意為"沒有害處的"，less為形容詞否定的后綴．故填寫harmless．

點評 此題考查詞根詞綴的運用．做題時根據(jù)原詞的提示，結(jié)合語境確定出其在句中的意義是關(guān)鍵；然后再運用詞綴的知識寫出單詞的正確形式．在本題中注意less為形容詞的否定的后綴．

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