lecture 反驳1。natural pesticide is easy to break down, even before the produce arrive the store, less harmful than normal pesticide
2.有 strict guideline 和step，不太可能产生 contamination problem.
3.expensive but worth it. 研究表明organic的东西，有更多的vitamins和nutrition。
2.students are more influenced by their teachers than by their friends. agree or disagree?
俺的学校要求低，86即可。俺只要不低于这个分数就行了。
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