7．This kind of medicine is for external use only．It cannot be taken by mouth．

分析 這種藥只能外用，不能口服．

解答 答案：external
根據(jù)句意以及首字母的提示可知，此處的意思是：外用的；由于此處用來修飾名詞use，故用形容詞external．

點(diǎn)評(píng) 做首字母填空題時(shí)，可根據(jù)句意以及首字母的提示判斷出空缺處的意思，從而確定出要填的單詞；然后從語法分析的角度，確定出應(yīng)填單詞的形式；因此在平時(shí)的學(xué)習(xí)中，除了應(yīng)牢固記憶單詞的拼寫之外，還要熟練掌握一些語法知識(shí)．

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