托福词汇题之maintain词汇介绍

　　整理历年托福词汇题，并附正确答案，本期题目为：maintain，看看你能答对吗?

　　But in many cases consumers are misled if they believe organic foods can maintain health and provide better nutritional quality than conventionally grown foods. So there is real cause for concern if consumers, particularly those with limited incomes, distrust the regular food supply and buy only expensive organic foods instead.

　　The word “maintain” is closest in meaning to which of following?

　　(A) improve

　　(B) monitor

　　(C) preserve

　　(D) restore

　　正确答案：C