If children really love candy，dentists recommend that they eat chocolate instead.Unlike hard candies，chocolate dissolves quickly in the mouth.Besides，chocolate contains tannins，which help to kill some of the bacteria in the mouth.But no matter what a child eats，brushing after each meal is still the best way to fight cavities.

　　5．What is the main purpose of this passage?

　　A．To discuss how cavities can be treated.

　　B．To point out the problems with Halloween celebrations.

　　C．To tell parents what sweets are less damaging to their children's teeth.

　　D．To teach parents the meaning of Halloween candy for their children.

　　6．Why are hard candies especially bad for teeth?

　　A．They may break the children's teeth.

　　B．They contain too much sugar.

　　C．They help bacteria to produce tannins.

　　D．They stay in the mouth for a long time.

　　7．According to the passage，which of the following is a better choice for Halloween treats?

　　A．Chocolate.　B．Crackers.

　　C．Raisins.

　　D．Potato chips.

　　8．According to the passage，which of the following is TRUE of tannins?

　　A．They are produced when the bacteria digest the food.

　　B．They help to get rid of some bacteria in the mouth.

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