原标题：留学essay写作到底是怎样评分的？
Essay一直以来都是让中国学生头大的存在，许多学生感觉自己分明彻底清楚题目中的知识点，可是终究得到的分数却不尽善尽美。
因而掌握essay的答题思路，理清essay结构就显得特别的重要。
今天和同学们共享一道AS部分microeconomics的essay。（Edexcel考局）
ExtractA
Step1、审题+结构确认
正如中文写作相同，<a href="http://ording to the Extracts.
For example:
•Risk of nuclear accident–local schools and businesses close,impact on property prices.
•High doses of nuclear radiation leaks increase the risk of cancer–loss of family income,employment,contribution to local economy,costs to NHS.
•Cost of storage for future generations–opportunity cost of resources(land)tied to this,resulting in loss of income to farmers for example.
•Opportunity cost of subsidies to nuclear industry,subsidy cuts to solar businesses.
Part2、Discuss whether it is over or under produced
For its external cost,it may be over-produced,but for the costs of its substitutes,it may be under-produced.You have to analyse both according to the Extracts.
Taking the costs of substitutes as an example：
Reduced external costs in production of substitutes/external benefits may mean it is under-produced:
•Curb greenhouse gas emissions which are causing climate change,by using nuclear,resulting in less flooding or storm damage reducing insurance costs to businesses.Extract C
•Building new nuclear reactors allow positive local economic effects from job creation.
•Provide‘affordable energy’helping businesses stay open thus protecting jobs and ending fuel poverty resulting in lower demands for health care.Other evaluation points might include:
•Magnitude–depends on relative size of external cost.
•Measurement difficult–putting a value on external costs.
•Energy efficiency measures more preferable.
•Short term/long term costs and benefits.
Part 3、Further Conclusion
You have to make a deep conclusion according to or your analysis above to make your essay more organized and considered
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