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Scientists were embroiled (使卷入) last week in an international row over genetically modified cotton (GM cotton).
A study in China suggested for the first time that the crop was permanently damaging the environment and that insects were building up resistance to it.
The study, by the Nanjing institute of Environmental Science, combined the laboratory and field work from four Chinese scientific institutes. The study was done over a several - year period.
GM Cotton had a gene resistance to the cotton bollworm (棉铃虫) and isolated from the bacterium (细菌) named Bacillus thuringiensis (Bt), but the study found that it harms the natural parasitic (寄生的) enemies of the cotton bollworm.
It also indicated that populations of pests besides the bollworm had increased in Bt cotton fields and some had replaced the bollworm as the primary pest.
However, the leading GM company, the US's Monsanto, which controls more than 80 per cent of the Bt cotton grown worldwide, dismissed the research.
It said that the industry has always cited GM cotton as its biggest success, because it can increase yields by up to 60 per cent and reduce the need for pesticides (杀虫剂) by 80 per cent.
But, unfortunately for the industry, (80) the scientists also found that the resistance of Bt cotton to bollworm decreased significantly over time.
Why scientists say no to GM cotton？
Working on a newspaper is a very busy job. Many newspapers【21】each day, and they have to【22】people with all the latest news. The editor is in【23】of the paper. Reporters【24】news stories and write them. The paper is printed so that it is【25】sale every morning.
People【26】up the editor when something interesting【27】. The editor sends a reporter and a photographer to find out【28】.
The reporter phones the newspaper to tell the story. A typist types it【29】. Next, the editor decides how much "space" to give the story. Important stories【30】most of a page. The stories are keyed (输入) into a computer and【31】print.
The first copies are called "proofs (校样) ". Another editor【32】mistakes. The stories are all【33】in the paper. Then the paper is printed.
The newspapers are【34】by lorry, plane or rail.【35】are taken all over the country. The【36】arrive early in the morning, and people buy them.
Not all newspapers【37】every day. Some are weekly with a Sunday edition. Local (地方的) newspapers【38】the news for different parts of the country.
Working on a daily paper is always busy. But people working on weekly papers do not have to work【39】such a hurry. Sometimes reporters【40】all over the world to report news.
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