1、雅思（写作）模拟试卷 200及答案与解析 1 As a class assignment you have been asked to write a description of how this plastic is produced and then broken down. Using the information in the diagram, write a description of the cycle. You may use your own knowledge and experience in addition to the diagram. 2 As a class
2、 assignment you have been asked to write a description of life cycle of the silkworm and the production of silk cloth. Using the information in the diagram, write a description of the cycle. 雅思（写作）模拟试卷 200答 案与解析 1 【正确答案】 The diagram shows in four stages how plastic is produced and then broken down.
3、According to the diagram, in the first stage, cereal crops are harvested and taken to a factory. Next, in the factory, giucose is extracted from cereal crops. Stage three of the process is when the giucose then passes into a bacferiai fermentation chamber, where the process of fermentation produces
4、a type of plastic called PHB polymer. This can be used to make piasfic bottles to hold shampoos and detergents. When these plastic bottles are thrown away, they may be disposed in three ways. First, they may be recycled. Another way is that they may also be filled in land. In this way, the oxidation
5、 products from the landfill sites are released slowly into the atmosphere. Other discarded bottles are burnt or biodegraded and send out carbon dioxide info atmosphere. Finally, cereai crops require carbon dioxide in order to grow, and these crops are used in the manufacture of the new piasfic. Thus
6、 the process diagram illustrates the cycle of the plastic. 2 【正确答案】 The first diagram shows that there are four main stages in the life of the silkworm. First of all, eggs are produced by the moth and it takes ten days for each egg to become a silkworm larva that feeds on mulberry leaves. This stag
7、e lasts for up to six weeks until the larva produces a cocoon of silk thread around itself. After a period of about three weeks, the adult moths eventually emerge from these cocoons and the life cycle begins again. The cocoons are the raw material used for the production of silk cloth. Once selected
8、 they are boiled in water and the threads can be separated in the unwinding stage. Each thread is between 300 and 900 metres long, which means they can be twisted together, dyed and then used to produce cloth in the weaving stage. Overall, the diagrams show that the cocoon stage of the silkworm can be used to produce silk cloth through a very simple process.
