The electricity must be at a very low voltage in order to travel across the gap and create a good spark.()
- · 有8位网友选择 对,占比80%
- · 有2位网友选择 错,占比20%
A、supply
B、provide
C、afford
D、offer
A、Number of feeding Trichinella spiralis cysts
B、Viability of the spiralis cysts
C、Location of larvae parasitism
D、Host immunity to Trichinella spiralis
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 1000 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(分解) 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 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 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. 小题1:Daniel Burd won first prize at the Canada-Wide Science Fair because________.
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A、self-appraisal
B、objective setting
C、system inauguration
D、development plan
A、They choose a job without thinking it through
B、They become stuck in the same job for decades
C、They spend an average of one year finding a job
D、They get bored after working for a period of time
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