题干


 It is believed in some ways that the daughter is father's lover. But my experience has taught me in a different way. For a long time, my father has been a very vague figure(模糊的形象)to me. He was a man of few words, tall but slim and nothing else.

 When I was in primary school, my father was never there to pick me up, and he never came to any of my parent-teacher meetings. He was always busy doing projects. I remember when I was in middle school and my head was badly hurt in a PE class. During my operation, my father was nowhere to be found. This hurt me most. At that moment, I considered my father as a cold-blooded man who did not care about me at all.

 But things seemed different at my high school graduation ceremony, where I was chosen to represent my class and give a speech. My father, once again, told me he had a business trip in a place outside the city and would be unable to show up(露面).“Don't come. I will be very nervous if I see you,”I told him.

 I remember my speech went smoothly. After the ceremony was over and I was about to leave. I suddenly noticed a familiar(熟悉的)looking man sitting in a corner of the hall. It was my father! I was so surprised that I rushed to him with tears(眼泪)running down my face. "Well done,"he said. His eyes were also filled with tears.

 Later, I found out that my father had managed to finish his work by staying up late, and he drove for eight hours to get back. He had been sitting in the corner because he didn’t want me to see him. My father remembered every word in my speech.

 For much of my life, I described my father was a cold-blooded man who only cared about his work. But when I thought deeply about this, it was obviously(明显地)not true. At my graduation ceremony. I could feel my father's deep love. The fact is that seeing is not believing, and seeing may not be the fact if we don't perceive(感知)the world with our hearts and minds. There's no doubt that life doesn't lack(缺少)love, but sometimes our eyes have trouble seeing it.

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    We produce 500 billion of plastic bags in a year worldwide and they are thrown away polluting oceans, killing wildlife and getting dumped in landfills where they take up to 1,000 years to decompose. Researchers have been unsuccessfully looking for a solution.

    The 16-year-old Canadian high school student, Daniel Burd, from Waterloo Collegiate Institute, has discovered a way to make plastic bags degrade(降解) in as few as 3 months, a finding that won him first prize at the Canada Wide Science Fair, a $10,000 prize, a $20,000 scholarship, and a chance to revolutionize a major environmental issue.

    Burd's strategy was simple: Since plastic does eventually degrade, it must be eaten by microorganisms(微生物).If those microorganisms could be identified, we could put them to work eating the plastic much faster than under normal conditions.

    With this goal in mind, he grounded plastic bags into a powder and concocted(调制) a solution of household chemicals, yeast(酵母) and tap water to encourage microbes growth.Then he added the plastic powder and let the microbes work their magic for 3 months.Finally, he tested the resulting bacterial culture on plastic bags, exposing one plastic sample to dead bacteria as a control.Sure enough, the plastic exposed(暴露) to the live bacteria was 17% lighter than the control after six weeks.

    The inputs are cheap, maintaining the required temperature takes little energy because microbes produce heat as they work, and the only outputs are water and tiny levels of carbon dioxide.

    "Almost every week I have to do chores and when I open the closet door, I have piles of plastic bags falling on top of me.One day, I got tired of it and I wanted to know what other people are doing with these plastic bags.The answer: not much.So I decided to do something myself." Said Daniel Burd.