Читать книгу Ontario Teachers' Manuals: Household Management - Ontario. Department of Education - Страница 21

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The black-boards should be of slate or glass, and as large as the size of the room allows. The windows and doors should be so placed that there will be unbroken stretches of wall for this purpose. Part of the black-board should be provided with a sliding board which, when required, can be drawn to conceal what is written. A separate black-board for current prices of common food materials is an excellent idea. The responsibility of keeping these prices correct should be given to the pupils.