55.A.lesson
B.skill
C.story
D.example
55.A
lesson 在这里的意思是“教训”,即那次经历对我来说是一个很好的教训。第三部分:阅读理解
We produce 500 billion of plastic bags in a year world-wide and they are thrown away polluting oceans, killing wild-life 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 3months, 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 ground 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.
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