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2. Read the short text below and answer the question:

Are the excavators fast-moving machines?

Site preparation and excavation are labour-consuming operations. At present they are the most fully mechanized of all the operations carried out in building construction. But earth-moving machines are heavy and slow-moving units; therefore they must be carried from site to site on special trailers. It is clear that such expensive mechanical plant as excavators must be made to carry out various classes of work.