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We produce 500 billion of plastic bags in a year worldwide and they （1）DD away polluting oceans， （2）BB wildlife and getting dumped in landfills where they take up to 1000 years to decompose.Researchers （3）BB unsuccessfully looking for a solution yet.The （4）CC Canadian high school student，Daniel Burd，from Waterloo Collegiate Institute，has discovered a way to make plastic bags （5）AA in as （6）AA 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 microbes （微生物）. （7）DD those microbes could be identified，we could put them to work eating the plastic much （8）BB than under normal conditions. （9）CC this goal in mind，he grounded plastic bags into a powder and concocted （調(diào)制） a solution of household chemicals，yeast （酵母） and tap water （10）DD microbes growth.Then he added the plastic powder and （11）AA the microbes work their magic （12）AA 3 months.Finally，he tested the resulting bacterial （細(xì)菌的） culture on plastic bags，exposing one plastic sample to dead bacteria as a control.Sure enough，the plastic （13）CC exposed to the live bacteria was 17% lighter than the control after six weeks.The inputs are cheap：maintaining the required temperature （14）BB little energy because microbes produce heat as they work，and the only outputs （15）DD water and tiny levels of carbon dioxide.
| （1） | A．throw | B．threw | C．has thrown | D．a(chǎn)re thrown |
| （2） | A．kill | B．killing | C．to kill | D．killed |
| （3） | A．had | B．have been | C．have | D．were |
| （4） | A．16 years | B．16 years old | C．16-year-old | D．16 year old |
| （5） | A．degrade | B．degrading | C．degraded | D．to degrade |
| （6） | A．few | B．fewer | C．little | D．less |
| （7） | A．So | B．But | C．Because | D．If |
| （8） | A．fast | B．faster | C．fastest | D．the fastest |
| （9） | A．In | B．By | C．With | D．To |
| （10） | A．encourage | B．encourages | C．encouragement | D．to encourage |
| （11） | A．let | B．letted | C．letting | D．to let |
| （12） | A．in | B．for | C．by | D．on |
| （13） | A．what | B．how | C．which | D． / |
| （14） | A．take | B．takes | C．taking | D．took |
| （15） | A．be | B．been | C．is | D．a(chǎn)re |
【考點(diǎn)】說明文．
【答案】D；B；B；C；A；A；D；B；C；D；A；A；C；B；D
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/5/27 14:0:0組卷：15引用：1難度：0.4
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Interesting funny sad amazing magical excitingStar rating：
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★★★★★
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D．The other four children went into the factory without invitation.發(fā)布：2025/1/30 8:0:1組卷：10引用：2難度：0.9