Plastic-Eating Worms
Humans produce more than 300 million tons of plastic every ye
ar. Almost half of that winds up in landfills(垃圾填埋场), and up to 12 million tons pollute the oceans. So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.
Researchers in Spain and England recently found that the worms of the greater wax moth can break down polyethylene, which accounts for 40% of plastics. The team left 100 wax worms on a commercial polyethylene shopping bag for 12 hours, and the worms consumed and broke down about 92 milligrams, or almost 3% of it. To confirm that the worms’ chewing alone was not responsible for the polyethylene breakdown, the researchers made some worms into paste(糊状物) and applied it to plastic films. 14 hours later the films had lost 13% of their mass — apparently broken down by enzymes (酶) from the worms’ stomachs. Their findings were published in Current Biology in 2017.
Federica Bertocchini, co-author of the study, says the worms’ ability to break down their everyday food — beeswax — also allows them to break down plastic. ＂Wax is a complex mixture, but the basic bond in polyethylene, the carbon-carbon bond, is there as well, ＂she explains, ＂The wax worm evolved a method or system to break this bond. ＂
Jennifer DeBruyn, a microbiologist at the University of Tennessee, who was not involved in the study, says it is not surprising that such worms can break down polyethylene. But compared 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.＂
43．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.
44．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
45．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
46．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.
答案
43．C
44．B
45．D
46．C
【解析】
【分析】
本文为说明文。文章介绍了一种吃塑料的虫子大蜡螟，它胃中的酶能够降解塑料，这为解决塑料污染提供了新的途径。
43．细节理解题。根据文章第三段Federica Bertocchini, co-author of the study, says the worms’ ability to break down their everyday food — beeswax — also allows them to break down plastic.可知，研究结果发现，蠕虫分解日常食物的能力让它们可以分解塑料，也就是说它们可以消费塑料。故选C。
44．细节理解题。根据文章第四段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)?可知，下一步研究是辨清分解的原因，查明这种酶来源于哪里，是虫子自己产生的还是它肠道里的微生物产生的。故选B。
45．推理判断题。根据文章最后一段But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic.＂可以推断出，Bertocchini希望这种化学物质将来能在工业生产中使用，而不是仅仅依靠蠕虫来分解塑料。故选D。
46．写作意图题。根据文章第一段最后一句So far there is no effective way to get rid of it, but a new study suggests an answer may lie in the stomachs of some hungry worms.可知，有一种新的方法被用于分解塑料。再根据最后一段最后一句But she expects using the chemical in some kind of industrial process — not simply ＂millions of worms thrown on top of the plastic.＂可知，Bertocchini希望将这种方法推广到工业中。由此可以推知写作意图为介绍一种分解塑料的方法。故选C。
点睛：根据不同文体，推断目的意图。不同的文章可能有不同的写作目的，通常作者的写作目的有以下三种：1) to entertain readers（娱乐读者，让人发笑），常见于故事类的文章。2) to persuade readers（说服读者接受某种观点），常见于广告类的文章。3) to inform readers（告知读者某些信息），多见于科普类﹑新闻报道类﹑文化类或社会类的文章。阅读时要善于根据文章的文体来学会推断作者的情感态度和目的。本题的最后一题为写作意图题。文章为说明文，主要介绍了一项新的研究发现---蠕虫可以分解塑料。因此可以推着写作意图是告知、告诉读者一种新的分解塑料的方法。
