三、典型段落操练
要求：请撰写下列作文，注意其中说明原因段或说明方法段的写法。
练习一
Directions:For this part，you are allowed 30 minutes to write a composition on the topic Pets’Services.You should write at least 120 words and base your composition on the outline given below
1.如今宠物服务十分流行。
2.分析宠物服务流行的原因。
3.谈谈你的看法。
练习二
Directions:For this part，you are allowed 30 minutes to write a composition on the topic How to Deal with Sub-health.You should write at least 120 words and base your composition on the outline given below
1.现代社会很多人都处于“亚健康”状态。
2.分析造成“亚健康”的原因。
3.应该如何解决“亚健康”问题？
参考范文
练习一
Pets’Services(https://www.daowen.com)
第一段：概述现象段
Nowadays，more and more pets’services emerge in the markets，which have aroused great concern.Many people send their pets to the related shops to accept the pets’service and the pets do become more beautiful and healthier than ever before.In addition，pets’services are diversified，such as pets’barbershops and pets’canteens.The reasons for this phenomenon are varied.
第二段：说明原因段
Among all these reasons，the owner’s love for pets plays a critical role.Regarding pets as friends and family members，people would like to spend some money on their pets.Moreover，with the improvement of people’s living standards，the pets’service，a new and profitable business attracts a lot of people’s attention.Besides，large investment in pets’services makes the popularity of these services possible.
第二段：总结观点段
In my opinion，pets’services do good to both the society and the individual.For one thing，it can offer more job opportunities and stimulate the development of economy.For another，it makes the pets more pleasing to both the eye and the mind，thus people becoming happier when stay with their beautiful pets.Therefore，the development of pets’services should be encouraged.
练习二
How to Deal with Sub-health
第一段：概述问题段
Nowadays，quite a few people are suffering from sub-health.Indeed，sub-health can result in both physical and mental diseases.Even worse，people who suffer from sub-health are more easily to die prematurely.
第二段：说明原因段
There are many factors resulting in sub-health.Among these，the pace of modern life plays a vital role.The fast pace of modern life exerts great pressure on people and pressure is the ultimate cause of sub-health.What’s more，modern people spend too much night time working or entertaining，which seriously affects their health.
第三段：说明方法段
Considering the great harm brought by sub-health，I think it is high time that we took effective measures to prevent sub-health.Firstly，people must have enough sleep to ensure that they can regain energy and physical strength.Secondly，people should have a rational diet under the instruction of doctor in order to avoid the diseases caused by malnutrition or super nutrition.Thirdly，people should regularly do some exercise to keep healthy.To conclude，it is an urgent thing to take flexible measures to avoid the threat of sub-health.