(
课件网) Yes If it includes all the key points, it serves as the main idea; If not, add supporting details. No Get the main idea by combining all the key infomation. general idea structure topic information fun_ction Problems Reasons Suggestions The author points out that cigarette butts and plastic bags are serious _____ _____ and the _____ to improve them. environmental problems ways Argumentation Main-argument Sub-arguments Conclusion Para 1: Problems All sorts of items become litter, but two of the most common and most dangerous are cigarette butts and plastic bags. Litter is a big problem for our environment, but it is a problem that individuals can easily do something about. Not littering at all or cleaning up litter, such as cigarette butts and plastic bags, greatly improves the quality of our environment. Tip 1: To find the topic sentence, it is positive to refer to the main idea of the whole passage. Two of the most common and most dangerous litter to environment are cigarette butts and plastic bags. Para 2: Reasons Although cigarette butts are small, they are bad for the environment. too general? Over 1,600 billion cigarettes... about 4.5 trillion butts are littered... Apart from the fact that butts spoil the beauty of the environment, they contain some very toxic chemicals. endanger plants and animals Tip 2: If the topic sentence is too general, add the supporting details. Cigarette butts are bad for the environment, spoiling the beauty of environment and containing toxic chemicals, which endanger plants and animals. Para 3: Reasons Plastic bags are another common form of litter that is a danger to the environment. ...these resourses are lost to us. ...travel long distances. Plastic bags kill up to one million seabirds... long lasting widespread kill animals ...these resourses are lost to us. waste of resources Plastic bags are a danger to the environemnt, for they are a waste of resources, long lasting, and widespread, killing animals. Para 4: Suggestions Not littering at all or cleaning up litter, such as cigarette butts and plastic bags, greatly improves the quality of our environment. (Para 1) So, if people have to smoke, they should not throw away the butts but put them in the rubbish bin instead. (Para 2) It is up to people not to let plastic bags become litter. It would be better if they used fewer and recycled them. (Para 3) Cleaning up your cigarette butts and plastic bags would improve the environment. The earth would be a better place because it would be less polluted. And we would know that we were doing something to look after our planet. However, I believe the best solution would be not to smoke or use plastic bags at all. (Para 4) Tip 3: If there is key information related with the last part, it is positive to leave it to the last part. Cleaning up your cigarette butts and plastic bags would improve the environment, or not to smoke or use plastic bags at all. Two of ... ...
