题目内容

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

分析 你不必害怕因为这些昆虫完全是无害的．

解答 答案：harmless 根据关键部分You needn't be frightened 并结合给出的提示词harm，可知只有在这些昆虫没有害的情况下才会没有必要害怕，所以这里应该用与harm有关的表否定意义的形容词harmless，意为"没有害处的"，less为形容词否定的后缀．故填写harmless．

点评 此题考查词根词缀的运用．做题时根据原词的提示，结合语境确定出其在句中的意义是关键；然后再运用词缀的知识写出单词的正确形式．在本题中注意less为形容词的否定的后缀．

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