When you look at your food, some ingredients are easy to see. For example, there is cheese on your pizza and butter on your bread. But our meals are also filled with ingredients you can’t see. And you might be surprised to learn just how much those hidden (隐藏的) ingredients affect your health.
Salt is a perfect example of an ingredient that you might not notice, even when you eat a lot of it. More than 75% of the salt we eat is hidden in restaurant meals, fast food and processed (加工过的) food , such as French fries, hot dogs and even biscuits.
Salt is important to us. It keeps our muscles (肌肉）working and our nerves (神经）sending  messages through the whole body. Salt can be used to clean teeth, to make our skin smooth or added to a relaxing bath. Salt is also used to help make food last (持续) longer.
However eating too much salt can cause heart problems. For a long time, heart trouble has been regarded as an adult problem, but new research shows that salt is starting to affect kids. Then how much salt is safe for kids every day? Let's look at the following chart:

Ages	Amount of Salt Every Day
1—3 years old	2 grams
4—6 years old	3 grams
7—10 years old	5 grams
11 or more than 11 years old	6 grams

Kids should not eat more than that.
The underlined word “ingredients” means “__________” in Chinese.

A．配料

B．热量

C．营养

D．脂肪

The first two paragraphs tell us _________.

A．how much salt people need every day	B．the result of eating too much salt
C．the importance of salt in our everyday life
D．though people eat much salt every day, they may not notice it

Which of the following is Not the use of salt according to the passage?

A．Salt keeps muscles working.	B．Salt helps to make food last longer.
C．Salt helps to see clearly.	D．Salt can be used to clean teeth.

If Tim is 10 years old, how much salt should he eat every day?

A．2 grams.

B．3 grams.

C．5 grams.

D．6 grams.

What can we learn from the passage?

A．Young children have few heart problems according to the new research.

B．A lot of food we eat has hidden salt in it, even some biscuits.

C．Salt can be used instead of soap while we’re taking a bath.

D．A five-year-old boy should have at least six grams of salt every day.