阅读下面一段文字，按要求写一篇作文

李嘉诚说：“鸡蛋，从外打破是食物，从内打破是生命。”人生亦如是，从外打破是压力，从内打破是成长。如果你等待别人从外打破你，那么你注定成为别人的食物;如果能自己从内打破，那么你会发现自己的成长相当于一种重生。

要求：请根据你对材料的理解，选择一个角度，自定立意，自拟文题，写一篇不少于800字的记叙文或议论文。

A

    Last week, 36 students in Linyi, Shandong Province, wore beautiful clothes in a show. Their clothes were made of all kinds of waste things.

    The show gave the students a chance to make clothes with their own hands. It also helped them learn to make good use of waste things.

    "We hope to save energy. Our world is short of energy, so I don't want to throw old things away," said Xie Jing at Linyi Art School. Xie had more than 20 CDs from her family and friends. "Though the CDs are old, I look very cool in them!" she said.

    Wang Dandan, a student from the same school, looked like a farmer in her straw (稻草) coat and hat. She picked the straws from the fields and put them all together. "I want to show what people wore in the past," she said.

    Du Yue made clothes like astronauts' clothes. Her clothes were white. When she walked, she tried to be slow. It looked like she was walking on the Moon. "I wish that I could walk on the Moon!" she said.

如图所示，水平桌面上固定有一U形金属导轨MNPQ，处在与它垂直的匀强磁场中．有一导体棒ab在导轨上向右匀速运动，导体棒与导轨始终接触良好，经过0.2s，从“1”位置运动到“2”位置．在这个过程中，穿过由导轨和导体棒组成的闭合回路的磁通量从0.2Wb增加到0.6Wb．求：

①这段时间内通过回路的磁通量的变化量△φ=____；

②这段时间内回路中的感应电动势E=____；

③若U形金属导轨电阻不计，导体棒的电阻R=5Ω，在5s时间内导体棒产生的热量为4J，则这段时间内回路中的感应电流为____。