A. Thanksgiving Day used to be a holiday to celebrate a good harvest.

B. Abraham Lincoln was not the first to decide on Thanksgiving celebrations.

C. Thanksgiving Day is celebrated to express the American and Indian people's thanks to God.

D. There's little difference between the American way and the Canadian way to celebrate Thanksgiving Day.

4. The passage mainly tells us________．

A. how Thanksgiving Day is celebrated in the U.S.A.

B. how Thanksgiving Day came into being and the different ways it is celebrated

C. that Thanksgiving Day is in fact a harvest holiday

D. how the way to celebrate Thanksgiving Day changed with the time and places

B

If you're like most kids，you've probably heard at least one parent say，"Don't forget to take your vitamin(维生素)!""Eat your salad－it's packed with vitamins！" But what exactly are vitamins?

Vitamins and minerals are found in foods we eat. Your body needs them to work properly so you grow and develop just like you should. When it comes to vitamins, each one has a special role to play. For example, Vitamin D in milk and fish helps your bones. It's also great for forming strong teeth. Vitamin A in orange fruits and vegetables, liver and milk helps you see at night. Vitamin C in oranges and some green vegetables helps your body heal if you get a cut. Vitamin E in nuts, seeds, whole grains and leafy vegetables protects your lungs from becoming damaged by polluted air. B vitamins in green leafy vegetables help your body make energy.

When you eat foods that contain fat--soluble(脂溶性的)vitamins, the vitamins are stored in the fat tissues in your body and in your liver(肝脏). They wait around in your body fat until your body needs them.

Fat--soluble vitamins are happy to stay stored in your body for a while--some stay for a few days, some for up to 6 months! Then, when it's time for them to be used, special carriers in your body take them to where they're needed. Vitamins A，D, E, and K are all fat--soluble vitamins.