During this period American car manufacturers set about improving their products and work efficiency.As a result,the yearly income of the average family increased from 1950 to 1975 faster than the price of cars.For this reason（ ）a new car takes a smaller part of a family s total earmnings today.

单选题

During this period American car manufacturers set about improving their products and work efficiency.As a result,the yearly income of the average family increased from 1950 to 1975 faster than the price of cars.For this reason（ ）a new car takes a smaller part of a family s total earmnings today.

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单选题

During the early period of ocean navigation,（ ）any need for sophisticatedinstruments and techniques.

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Use a 12-inch wrench handle during this procedure.

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During this phase，the analyst must become fully aware of the （ ）。A.main symptom

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Henry did his job _____ during his trial period, so actually he hadn’t been employed by the company at all.

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