12．You'd better be careful with the mushrooms here on the mountain as some can be poisonous．

分析 你最好當心山上的蘑菇，因為有些可能會有毒．

解答 答案：poisonous
根據(jù)句意以及首字母的提示可知，空缺處意為：有毒的，有害的；由于此處用在系動詞be之后作表語，故用形容詞poisonous．

點評 做類似的題時，首先應根據(jù)句意以及首字母的提示判斷出空缺處的意思；其次從語法分析的角度，確定出應填單詞的形式；因此在平時的學習中，除了應牢固記憶單詞的拼寫之外，還要熟練掌握一些的語法知識．

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