1) Where does the water come from? a) From a bank b) Lakes c) Of a store d) Rivers e) From a supermarket f) Ponds 2) What are the correct postures in front of a cell phone or laptop?  a) always keep your gaze straight ahead b) bend the neck c) keep your shoulders relaxed d) Do not lean your back against the back of the chair e) Back you must maintain its natural curvature and always supported by the backrest f) put your feet firmly on the floor

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