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e来表达。
67.scratched改为were scratched或they scratched。若用were scratched，则此句为倒装句，主语是words,用过去时和被动语态。若用they scratched，则words是宾语，该句缺主语，根据上下文，加上they即可。
68.it改为them。句中的pick it up 中“it”指的是主句中的letters。根据单复数一致的原则，应用them指代letters。
69.golden改为gold。golden 是形容词，意为“金色的”，“黄金般的”，gold 作名词，意为“黄金”，作形容词，意为“全制的”。故“淘金热”应为“gold rush”。
70.sail 改为sailing。根据boats sail east could pick up 中could为谓动词，到sail 应变为现在分词，作定语，修饰boats。若无字数限制，改成boats which sailed east 这样的定语从句也可以。
Part Ⅴ
写作指导
本文应先说明环境破坏的现象，然后分析造成的原因，最后再提出了环保建议。分三个部分论证。可采用举例法论证，关联词如表示举例的for instance; 表示结果的consequently;表示进一步说明或强调的关联词：besides等可以试着采用。再由于文章涉及环境问题，许多动词的施动者不清楚，因此多数句子最好用被动态。
Sample writing
How to Solve the Problem of Environmental Protection
The problem of environmental protection has drawn attention and concern of people all over the world, for people have realized that humans are a part of nature and should be responsible for the ecological balance. The world population is growing so rapidly that our earth seems too crowded. Vast stretches of fertile lands are being turned into deserts. The reduction of wooded areas has resulted in increased flooding and water shortages in dry seasons.
There are two basic sources of the problems. One is man-made. For instance, people cut down trees either for sale or for fuels. The coverage of the world’s forests is rapidly diminishing, which is attributed to the denudation and forest fires. Another destructive factor is war. During the wars in Iraq and Yugoslavia, many chemical weapons were used. Consequently, the natural environment is seriously damaged. The other is natural catastrophes, such as forest fires, floods, and volcanoes.
So, governments of all countries should establish strict laws to prevent the environment from being further polluted. Measures should be taken to make people realize the urgency of protecting our earth. Besides, more greenbelts should be built every year, and forests should be well protected. Everyone should try his best to make our earth a better place to survive.
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