There are stars in the Galaxy. We can’t count them.

A. billion of B. billions

C. billions of D. Billion

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Different vitamins are found in different foods. Then which foods should be eaten to keep us healthy? Let's look at some important vitamins for the answer.

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Vitamin B changes foods into energy and helps the heart and nervous system (神經(jīng)系統(tǒng)) to work smoothly. Without it, we will be weak and will not grow. It is found in grains and other foods like beans, nuts, meat and fish.

Vitamin B helps to produce red blood cells. It is found in foods like eggs, meat, fish, milk and green leafy vegetables.

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Vitamin D increases the levels of calcium (鈣) in the blood. Calcium is needed for verve and muscle (肌肉) cells to work normally, as well as to build strong bones. Fish liver oil has vitamin D. In some countries, milk producers add vitamin D to milk so that it will be good for children.

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