20 years ago D. There haven't been any seed storage centers in the

　　world before 答案与解析：C　由最后一段第3、4句话可知C项正确。 19. What is probably the best title of the passage?

　　A. Noah's Ark (诺亚方舟) of Plant Seeds in Plan

　　B. The Best Place to Store Seeds

　　C. Concerns of World Food Supply

　　D. A New Way to Feed the World 答案与解析：A　由本文的主要内容可知A项为最佳选项。 B

　　The unquestioned role of a student is to learn as much as possible through whatever means it takes to acquire knowledge.

　　Teachers and professors are human beings and are therefore not perfect. No one knows the correct answer to every question even when you limit the questions to a certain field of study. Having certain skepticism (质疑) about what they are being taught can help students to make the teachers even better by correcting mistakes and misinformation.

　　Students certainly have a huge role in their own abilities to learn. Teachers should act more as guides along the way rather than try to force，each student to learn. The best teachers in the world cannot teach an unmotivated student. If the teacher, for whatever reason, cannot motivate the student, then the student must somehow find a way to motivate himself or herself.

　　One method of doing this is by becoming an active rather than a passive student. The more the student involves himself or herself in the act of studying, the better he or she can learn. One of the best ways to become more active is simply to ask the teacher or professor questions. Students who passively sit in a classroom and take everything that the teacher says for granted are not fully using their mental capacities to learn.

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