Вставить артикль mr. jones was teacher of physics school, he was fond of the experimental method in physics and often told his pupils to use this method. one day mr. jones came to school on new bicycle. bicycle had pair of pneumatic tyres, which had just been invented, and none of pupils had ever seen them. during lesson teacher took pupils into school yard and showed them new invention. "now, children," he said, "who can tell me what is inside this tyre that makes it so hard and yet so elastic? " boys touched tyres. " cotton-wool
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