4.Some jobs are more desirable than others.Entry­level positions in attractive industries such as publishing and television tend to be low­paying.Since talented people are willing to take entry­level jobs in these industries at salaries below what they could earn in other occupations，there must be other，non­wage rewards.It may be that the job itself is more personally rewarding，or that a low­paying apprenticeship is the only way to acquire the human capital necessary to advance.

　　5.On the other hand，compensating differentials are required when an occupation is very dangerous.Workers on skyscrapers and bridges command additional wages.Fire fighters in cities that have many old，run­down buildings are usually paid more than those in relatively tranquil rural or suburban areas.

　　答案相接:必修解析：alternative“替换的，供选择的”；impressive“给人印象深刻的”；effective“有效的”；aggressive“进攻的，挑衅的”。根据句意“由于有雾，高速公路被封闭了，我们不得不改走别的路线”可知，选D。

　　解析：for a start意为“首先；第一”，用于强调所叙述的一系列事实、观点中的第一条。by the way“顺便说”；on the other hand“另一方面”；sooner or later“迟早”。句意：汤姆不应该被派去执行这项任务，首先他没有足够的经验。答案：A

　　解析：句意：他需要每天给电动车充电，因为电池很快就用完了。make out填写，理解；come out出来，出版；turn out结果是；run out用完，耗尽。答案：D

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