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为什么喝石阡苔茶有利于健康长寿？

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（1）石阡苔茶生长环境无污染，严格按照有机茶、无公害茶、绿色食品技术要求进行全程监控监测管理。

（2）石阡苔茶产茶历史悠久，茶艺底韵深厚，耐人寻味。

（3）石阡苔茶富含钾、锌、硒，茶多酚含量32%，可抗氧化，养颜、护肤、抗衰老、降血脂、抗癌变、防治心血管病、诞年益寿。

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教学设计题：请为北师大版义务教育课程标准实验教材一年级下册《买文县》编写教学设计。
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I am honored to be here today, (1) Harvard at this celebration of the College Board’s half century of working to promote (2) and equal opportunity in higher education.
Before I say anything else, I want to thank everyone in the room for the work you do every day to make college (3) , available, and (4) for millions of young people across the country.
I want to focus my remarks on a matter of (5) to American familiesand to the future of the nation -- restoring education to its proper role as a (6) to equal opportunity and (7) in our society.
This has been an (8) in higher education, with great and creative efforts made by many institutions. Earlier this year, we announced a new (9) at Harvard aimed at the students from families of low and (10) income. Under our new program, families with incomes of (11) will no longer be expected to contribute to the cost of attending Harvard for their children. Families with incomes of less than $ 60,000 will also see their (12) reduced.
We are proud of this effort at Harvard, but we are aware that the programs of individual institutions with means can never be a substitute for our shared (13) to provide adequate funding for Pell grants and other financial aid, and for the state and community college systems that make higher education (14) and affordable for the (15) .
There is something empty about (16) initiatives that may be right for one institution without attention to their broader impact. (17) , we (18) if we urge changes in national policy without doing what we can on our own campuses.
In this spirit, I want to (19) today a problem that is emerging with (20) in this nation.
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