Recycling plastic has always been a stop-start effort,and the wide variety of plastics we produce,the pollution from waste,and other limitations make recycling an economic（经济）problem.It's estimated（估计）only 9% of plastic ever created has been recycled.But with the help of a chemical process,Canadian Miranda Wang and her company BioCellection want to change that.
Stability is one of plastic greatest qualities and downside.There's limited evidence that some plastics can biodegrade（生物降解）but largely photo-plastics degrade in the sun.It's a long process,and the truth is that we can only estimate how long it takes.Wang is looking to break the inaction and BioCellection's task is to make most plastic waste recyclable.
She outlines two current methods.One is to take plastics like water bottles,wash them,cut them,melt and reconstitute them. "That's a very limited process." she says,due to the requirement that plastics be "clean".The other,which can handle dirtier plastics and a level of pollution,is called hydrolysis（热解）.Intense heat is applied to break down plastics so they can be reused as oils for energy,but "it's not economical," she says.
BioCellection's solution builds on research from over ten years ago,Wang explains,when a US study discovered pure polyethylene powder（聚乙烯粉）could be broken down by a catalyst（催化剂）.Wang and her co-founder Jean hit upon a bacterium being able to eat plastic.In the years since,they engineered a comparable catalyst capable of doing the same job,only faster,which even works on plastics no one else can recycle at present. "We have now found a catalyst that is much cheaper than the one that was used before," Wang says.
Currently focusing on plastic films like shopping bags,the three-hour process breaks down plastic into chemicals that can act as the building blocks for more complex plastic products.
"Right now we're able to achieve about 70% transformation from plastic waste material to these chemicals," she adds,saying they're working to increase that figure.



Why has so little plastic been recycled？ ______

A. Plastic is chemically stable.
B. Recycling plastic led to pollution.
C. We produced various plastics.
D. Most photo-plastics degrade in the sun.

What does Wang think of the two current methods？ ______

A. Highly effective and dynamic.
B. Expensive and pollution-causing.
C. Limited and energy-consuming.
D. Widely used and recognized.

What did BioCellection find effective to recycle plastics？ ______

A. Polyethylene powder.
B. Chemical products.
C. Plastic films.
D. A catalyst.

What is the text mainly about？ ______

A. Miranda Wang and her company.
B. A new plastic recycling method.
C. The greatest downside of plastic.
D. Transformation of plastic waste.