PETS三级写作练习及和评分标准(2)
提高写作能力。
范文：Air Pollution
Air pollution is becoming a serous problem. A great deal of energy is needed to run the factories of modern industrialized nations. Automobiles, trains, planes and buses need energy, too. Nearly all of this energy is maintained by burning fuels. The burning produces wastes. Some of the wastes get into the air, causing air pollution.
This burning fuel gives off carbon monoxide that is harmful to our health, Carbon monoxide is a colorless, ordorless gas, and a deadly poison. When we inhale this poisonous gas, it will irritate the lungs, causing skin illness and hurts the eyes. Most electricity is generated by steam turbines. About half of the sulfur dioxide in the air comes from burning fuel to make steam. Nuclear power is thought to be a safe way of generating power. But the radioactive materials in these plants could present a danger in an accident.
It is now high time we took measures. Encouragingly, people everywhere have come to know the seriousness of air pollution. A satisfactory and complete solution to this problem requires the efforts and attention of all people. Certain streets should be closed to automobiles to lower the pollution levels. The amount of carbon monoxide that an engine gives off can be reduced by special devices. Also, engineers try to design and locate new plants that will do minimum damage to the environment.
短文写作的评分原则：
了解评分标准无疑会有利于我们把握好作文的方向，也有利于我们掌握写作过程中要注意的事项。由于PETS3主要包括了两大类题材作文的写作，其评分标准也分为了针对于所有类型作文的总体性评分标准，也有根据每次具体作文要求而制定的具体评分细则。
（一）评分的侧重点
要想在写作这一项得到理想的分数，除了在平时加强语言基本功训练、提高写作技能外，了解评分的程序、“投其所好”也是一个考生要注意的重要因素。虽然A、B两节的考查要点有所不同，但对考生的写作的基本要求应该是相同的。所以总体性评分原则对两节都适用。但又根据每节的不同测试要点，评分时有不同的侧重点。
A节应用文的侧重点在于信息点的覆盖和内容的组织、语言的准确性、格式以及语域的恰当与否。对语法结构的合理性、语法的准确及词汇的使用的灵活多样性的要求则根据试题作调整。允许在作文中使用提示语中出现过的关键词，但如果使用提示语中出现的词组或句子就会被扣分。
