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2018-08-26 17:07:53 来自 雅思 4.0 方法课作业
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The two figures below show the life cycle of silkworms and the stage of silk production.[br]The first picture, the life cycle of the silkworm, has four steps. First, the eggs are produced by moths. It takes 10 days for the eggs to turn into silkworm lava to use the mulberry leaves as food. This phase lasted for up to 6 weeks, and then the lava began to surround itself with silk. After three weekends, the lava finally emerged from the scorpion and became a moth. Then, the life cycle of the silkworm begins again.[br]The second picture shows the production of silk, with five steps. First, choose the mash as a silk material and then boil in water. Then, when the thread is unfolded, the line is 300-900 meters long and is ideal for twisting, weaving and final dyeing. Form a silk cloth.[br]In general, we can conclude from the figure that 茧 can be used as a raw material for silk fabric production.[br]The chart below shows the main reasons for the number of students in different age groups and the amount of support they receive from their employers.[br]Starting with the first chart, as the age increases, the student's professional will consumes less. 80% of people study in their careers under the age of 26, however, over the age of 49, only 18% of them are engaged in careers. In contrast, older people are more concerned with the joy of learning, so more than 49% of the elderly are interested in learning, which is very different from young people. Under the age of 26, only 10% of young people see learning as fun.[br]According to the second chart, between 26 and 30-39, their support from employers is getting lower and lower. However, employers provide more support to employees over the age of 39. It is unclear whether employer support is only for career-focused learning, but the highest level is for students who are primarily engaged in career purposes.[br]
1[br]The pie chart illustrates factors causing global land degradation,among which over-grazing ranks the highest (35%),followed by deforestation by tree clearance and over-cultivation, at approximately 30% respectively,whereas all other causes together are only responsible for a small part(7%).[br]The table explains how much land degradation occured in the 1990s and to what degree the different causes played part in it among three different regions.It can be seen that Europe had the severest land degradation by 23%,meantime,Oceania and North America had siginificantly lower percentage(13% and 5% respectively).Over-grazing appeared to be almost the sole reason for the issue(11.3% out of 13%),whereas deforestation seemed to be the number one cause in Europe(9.8%),with over-cultivation and over-grazing acounting for 7.7% and 5.5% of the land degraded respectively.Since North America was the least troubled by land degradation, the relevant numbers were shown to be comparatively small of which over-cultivation was the greatest reason(3.3%),followed by over-grazing(1.5%) and deforestation(0.2%).[br]Overall,Europe suffered the greatest land degradation in all three regions,and deforestation was the main cause responsible for it in the given period.[br]2[br]The pie charts illustrate the constitution of uk school spending in 1981,1991 and 2001. [br]Teachers’ salary was the largest part in all 3 years,accounting for 40%,50% and 45% of the whole expenditure rrspectively.Meanwhile,salaries paid out to other workers was the second largest in 1981(28%),and remained the second place in 1991(22%) after a decline.However,it continued to drop to 15% and was overtaken by spending on furniture and equipment(23%),which had represented only 15% and 5% of the total costs in 1981 and 1991.[br]Resources costs such as books were 15% and 20% respectively in 1981 and 1991,but suffered a drastic decline,accounting for 9% of the entire expenditure in 2001.Insurance costs,on the other hand,showes a continuous upward trend from 2% to 5% over the period.[br]Overall,it can be seen that the school’s main costs are salaries to teachers and other staff,particularly,with teachers’ salaries being the largest spender.While spending on equipments and insurances increases,salaries to other staff and costs on resources decreased.[br]3[br]The circular graph presents the main phases of the life of a silkworm.It starts when eggs are being laid by the moth that hatch in 10 days’ time and transform into silkworm larva which feeds on mulberry leaves.After up to 6 weeks’ growth, the larva starts to produce silk thread to make a cocoon around itself and it usually takes up 3 to 8 days to complete the cocoon.In 16 days, a moth emerge from the coccon,and then it start its life cycle all over again.[br]The cocoons produced by silkworm larvae are assessed and the selected ones are boiled in water ,then the boiled coccons are unwound to about 300 to 900 meters of thread each.The fine threads are then twisted into thicker ones which are dyed and weaved into the silk cloth.[br]We can see that the cocoon produced by the silkworm is the raw material for the silk cloth production.[br][br][br][br][br][br][br]