with previous studies，she finds the speed of breaking down in this one exciting．The next step， DeBruyn says，will be to identify the cause of the breakdown．Is it an enzyme produced by the worm itself or by its gut microbes(肠道微生物)?

　　Bertocchini agrees and hopes her team's findings might one day help employ the enzyme to break down plastics in landfills．But she expects using the chemical in some kind of industrial process - not simply ＂millions of worms thrown on top of the plastic．＂

　　24．What can we learn about the worms in the study?

　　A．They take plastics as their everyday food．

　　B．They are newly evolved creatures．

　　C．They can consume plastics．

　　D．They wind up in landfills．

　　25．According to Jennifer DeBruyn， the next step of the study is to ．

　　A．identify other means of the breakdown

　　B．find out the source of the enzyme

　　C．confirm the research findings

　　D．increase the breakdown speed

　　26．It can be inferred from the last paragraph that the chemical might ．

　　A．help to raise worms

　　B．help make plastic bags

　　C．be used to clean the oceans

　　D．be produced in factories in future

　　27．What is the main purpose of the passage?

　　A．To explain a study method on worms．

　　B．To introduce the diet of a special worm．

　　C．To present a way to break down plastics．

　　D．To propose new means to keep eco-balance．

　　 C

Steven Stein likes to follow garbage trucks．His strange habit makes sense when you consider that he's an environmental scientist who studies how to reduce litter, including things that fall off garbage trucks as they drive down the road．What is even more interesting is that one of Stein's