题目内容：

Do you always understand the instructions on a bottle of medicine? Here’s one for John. John is twelve years old. He had a bad cold and coughed(咳嗽) day and night. He went to see a doctor and was given some cough medicine. Please read the following instructions and see if you can understand them.

Cough Medicine: The medicine is for a person with a cough. Shake it well before use. Take it three times each day before meals or before sleep. Dose (药量): Age: over 14     2 teaspoonfuls 8~13      1 teaspoonful 4~7       1/2 teaspoonful Dot fit for children below the age of three or old persons with heart trouble. Put it in a cold place. Use it before December 1st, 2004.

1.John should take ____________ a day.

A．2 teaspoonfuls                         B．3 teaspoonfuls

C．4 teaspoonfuls                         D．1 teaspoonful

2.John should ___________ before he takes it.

A．shake the medicine well

B．eat nothing

C．do some exercises

D．drink a cup of tea

3.When people are ____________ years old, they cannot take this medicine.

A．eighty            B．thirty             C．two              D．twelve