18．The food safety is a serious        in our country．We should try to solve it．（　�。�
A．subjectB．programC．problemD．opinion

分析 食物安全在我國是個嚴重的問題．我們應該盡力解決它．

解答 答案：C；subject，科目；program，節(jié)目；problem，問題；opinion意見；根據(jù)句中信息We should try to solve it可知該空應填problem；故選C．

點評 根據(jù)語境，細讀選項，認真分析選項之間的異同，選擇正確的答案．

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