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                                                                                                    自给自足的人体生物能发电
         ①随着煤炭、石油等资源的日趋枯竭,环境恶化日趋严重,一些科学家为了开发更多的新能源,已把研究课题转向人类自身的生物能这一领域,利用人体生物能发电现已初见成效。
          ②人体中存在着一些化学物质,它们之间在发生反应时会产生化学能量。像新陈代谢过程中,葡萄糖和氧分子的反应就有能量释放出来。若稍加利用,这种能量就可以转化为电能。根据这一原理,科学家开始了人体生物电池的研究。
         ③据专家介绍,人体生物电池的电极是由两根长2厘米、直径约1/7000纳米的碳纤维制成,在每根碳纤维的外层还涂有一种聚合物,此外还有一种作为催化剂的葡萄糖氧化酶。聚合物的作用是将碳纤维与葡萄糖氧化酶连接成一个电路,而葡萄糖氧化酶则是用来加速葡萄糖与氧分子的化学反应。这种人体生物电池在37℃、pH为7.2的环境下工作,这很接近人体血液的温度和酸碱度。它产生的动力可以驱动一个监控糖尿病的小型传感器。
         ④人体生物能发电还有其他形式。当一个人坐着或站立时,就会持续产生重力势能。此时,若能采用特制的重力转换器就能将这种能转换成电能。美国有一家公司将发电装置埋在行人拥挤的公共场所,外面是一排踏板。当行人从踏板上走过时,体重压在踏板上,使与踏板相连的摇杆向另一个方向运动,从而带动中心轴旋转,启动与之相连的发电机
        ⑤除此以外,人体生物能中的热能也可被利用。人每天都要散发大量的热能,而且是通过辐射传播出去。一般一个50千克重的成年人一昼夜所散发的热量约为2500千卡。利用人体的热能制成的温差电池,可以将人体的热能转换成电能。这种温差电池做得很精致,只要放在衣服口袋里就能工作。它可以起到电源的作用,给助听器、袖珍电视机、微型发电机等供电,可谓是自己发电自己使用。
        ⑥人体能源可以说取之不尽,用之不竭,而且没有污染。如此神奇的能源是我们每个人都具有的,充分利用它,便会为我们的社会节约更多的能源,希望这种新型的能源会越来越多地造福于人类。

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                                                                   Tips for Cooking on a Tight Schedule

     From my experience,there are three main reasons why people don't cook more often:ability,money and time.____ Money is a topic I'll save for another day.So today I want to give you some wisdom about how to make the most of the time you spend in the kitchen.Here are three tips for great cooking on a tight schedule:

     1.Think ahead.The moments when I think cooking is a pain are when I'm already hungry and there is nothing ready to eat.So think ahead of the coming week.When will you have time to cook? Do you have the right materials already?____      

     2.Make your time worth it.When you do find time to cook a meal,make the most of it and save yourself time later on.Are you making one loaf of bread?____ It takes around the same amount of time to make more of something.So save yourself the effort for a future meal.

     3.____ This may surprise you,but one of the best tools for making cooking worth your time is experimentation.It gives you the chance to hit upon new ideas and recipes that can work well with your appetite and schedule.The more you learn and the more you try,the more ability you have to take control of your food and your schedule.

     Hopefully that gives you a good start.____ And don't let a busy schedule discourage you from making some great changes in the way you eat and live!

A.Try new things.

B.Ability is easily improved.

C.Make three or four instead.

D.Understand your food better.

E.Cooking is a burden for many people.

F.Let cooking and living simply be a joy rather than a burden.

G.A little time planning ahead can save a lot of work later on.