题目内容：

In western countries, more and more foods have additives in them. What are additives? Additives are chemicals which are put into foods to give them color and taste, to stop them going bad and so on. But doctors say that some additives can be very bad for our health.

Now let’s look at how additives can be bad for our health. For example, a little English girl called Sally Jones is two years old and quite ordinary (普通的). But when she was younger, she never went to sleep at night. She never got tired. Her parents were very worried. Finally, Sally’s parents took her to a special doctor.

The doctor said that she must never eat food with additives in it. He was sure that the additives had a very bad effect on her body, and made her too active. He was quite correct. As soon as Sally started to eat foods with no additives, she began to sleep well at night.

Now she is the same as other little girls, except that she can’t eat many foods that other children love, such as ice-creams, because they have additives in them.

根据短文内容，回答下列问题。

1.What’s the Chinese meaning of the word “additive”?

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2.What are the functions (功能) of the additives?

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3.Did Sally like sleeping at night before she went to see the doctor?

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4.What happened to Sally when she stopped eating the foods with additives?

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5.Why can’t Sally eat ice-creams?