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

分析 食品安全問題在我國是一個嚴重的問題，我們應(yīng)該努力解決它．

解答 答案：D
subject科目；program節(jié)目；opinion觀點；problem難題，問題；根據(jù)后句We should try to solve it（我們應(yīng)該努力解決它）聯(lián)系現(xiàn)實可知前句應(yīng)是表達：食品安全問題在我國是一個嚴重的問題，應(yīng)是解決問題，所以應(yīng)該用名詞problem"問題"．故選：D

點評 此題考查名詞的詞義辨析．做題時根據(jù)關(guān)鍵句聯(lián)系語境準確推出句意，并結(jié)合選項的含義選出符合意義的名詞．

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