[阅读理解] Look at the instructions on the bottle of the medicine and then choose the right answers. John is twelve years old. He had a bad cold and coughed day and night. He went to see a doctor. The doctor gave him some cough medicine. Cough Medicine Shake (摇动) it well before use. Take it three times each day before meals. Dose (药量): Age: over 14 2 teaspoonfuls(勺) 8—13 1 teaspoonful 4—7 1／2 teaspoonful Not right for children below the age of three. Put it in a cold place. Use it before December 1st 2002.
3. John should ________ before he takes it. A. shake the medicine well B. eat nothing C. do some exercise D. drink a cup of tea