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绘图题：画出标准孔板剖面示意图，并标明进.出口方向.
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参考答案：
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绘图题：画出标准孔板剖面示意图，并标明进.出口方向.
参考答案：
The requirements for high school graduation have just changed in my community.As a result，all students must ____sixty hours of service learning，____ they will not receive a degree.Service learning is a kind of learning that helps the community.__ __ of service learning include cleaning up a polluted river，working in a soup kitchen，or instructing a student.__ __ a service experience，students must keep a journal(日志) every day and then write a ____ about what they have learned. Supporters claim that there are many ____ of service learning. Perhaps most importantly，students are forced to think ____ their own interests and become ____ of the needs of others.Students are also able to learn real－life skills that ____ responsibility，problem－solving，and working as part of a team.____，students can explore possible careers ____ service learning.For example，if a student wonders what teaching is like，he or she can choose to work in a school classroom a few afternoons each month. ____ there are many benefits，opponents(反对者)____ problems. First，they ____ that the main reason students go to school is to learn core subjects and skills.Because service learning is time－consuming，students spend ___ time studying the core subjects.Second，they believe that forcing students to work without ____ goes against the law.By requiring service，the school takes away a student's freedom to choose. In my view，service learning is a great way to ____ to the community，learn new skills，and explore different careers.____，I don't believe you should force people to help others—the ____ to help must come from the heart.I think the best ____ is one that gives students choices： a student should be able to choose sixty hours of independent study or sixty hours of service.Choice encourages both freedom and responsibility，and as young adults，we must learn to handle both wisely.
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