My father is a worker and he works ________ a factory.

A. in B. with C. on

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Ruler

A ruler is a very useful tool. It can measure (測量) the length of something. There are many different kinds of rulers. Rulers are made of plastic, wood, cloth, and so on. We use a plastic ruler in the classroom. Rulers also come in different length. There are 15 cm rulers, 1m rulers and even longer rulers. Rulers were first made in the 1800s.

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Equal Sign (等號)

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