题目内容：

    Though plastic shopping bags are cheap and useful, they cause widespread pollution. Now, we may have an unlikely helper to help clean up our garbage — a small wax worm.

The worm’s hidden skills were discovered by accident. About two years ago, Federica Bertocchini, a developmental biologist at the Spanish National Research Council and an amateur beekeeper, was cleaning out bees’ nest that had been filled with worms. She removed the worms and put them in a plastic bag while doing the cleaning. After finishing, she went back to the room where she had left the worms, and found they had escaped from the bag. When she checked, she saw that the bag was full of holes.

Realizing she may have made an important discovery, Bertocchini teamed up with other researchers to conduct further research. They began by placing 100 worms on some plastic bags and discovered that over a 24-hour period, the worms managed to chew through 92 milligrams of plastic. The researchers make an appropriate judgment that at this rate, the group of worms could  degrade (降解) an average-sized 5.5-gram plastic bag within a month. To rule out the possibility that chewing was causing the degradation, the researchers spread the soft wet substance inside the body of some recently dead worms on a sheet of plastic. Sure enough, even the liquid was able to eat through the material, confirming that the worms have plastic-digesting enzymes (酶).

While the news is certainly encouraging, not everyone is convinced. The Michigan State University’s Ramani Narayan believes the tiny pieces of microplastics released by the plastic-eating worms would pick up harmful substances and transport them up the food chain, causing, even more, harm to the environment and human health. Susan Selke, director of Michigan State University School of Packaging, is concerned that the worms will not be able to survive in an oxygen-free landfills where large amounts of waste material are buried under the earth.

However, Bertocchini is not planning to transport worm armies to landfills. Instead, the researcher wants to identify the enzyme that helps degrade the plastic. The researcher says, maybe we can find the molecule (分子) and produce it on an industrial level, rather than using a million worms in a plastic bag.

1.What did the experiment of using dead worms find out?

A.Worms’ chewing may cause the degradation.

B.A plastic-eating chemical exists in wax worms.

C.Dead worms are effective in dealing with plastic.

D.It takes a long time for worms to degrade plastic.

2.What is Ramani Naravan's attitude to Bertocchini's finding?

A.Objective B.Convinced C.Questioning. D.Optimistic.

3.What might Bertocchini focus her later research on?

A.The structure of plastic-degrading enzymes.

B.The use of other worms in disposing plastic.

C.Wax worms’ adaptability to the landfill environment.

D.The chance of producing wax worms on a large scale.

4.What is the best title for the text?

A.Can wax worms save the environment?

B.Wax worms have an appetite for plastic.

C.Why do wax worms have plastic-eating skills?

D.Hungry worms join the fight against plastic pollution