1. 根據(jù)短文理解選擇正確答案。

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

      Vitamin A helps to protect skin from becoming dry. It is also helpful to the eyes. Without vitamin A, you cannot see well in darkness. Vitamin A is found in animal liver and the yellow part of eggs. Sweet potatoes, carrots and other dark-coloured fruit and vegetables have something that the body can change into vitamin A.

      Vitamin B₁ 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 B₁₂ helps to produce red blood cells. It is found in foods like eggs, meat, fish, milk and green leafy vegetables.

      Vitamin C is needed for strong bones and teeth, and for healthy blood vessels (血管). It also helps wounds to heal (愈合) quickly. The body stores little vitamin C, so we must get it every day in foods like oranges, tomatoes and cabbage.

      Vitamin D increases the levels of calcium (鈣) in the blood. Calcium is needed for nerve and muscle 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.

1. （1） Without __________, we cannot see well in darkness.

   A . vitamin A B . vitamin B C . vitamin C D . vitamin D
3. （2） According to the passage, vitamin Bi can be found in __________.

   A . fish liver oil B . grains, meat and fish C . milk and vegetables D . animal liver and eggs
5. （3） From the passage, we know that vitamin C is good for __________.

   A . the skin B . the heart C . blood vessels D . nerve and muscle cells
7. （4） Some milk producers add vitamin D to milk mainly to help children to __________.

   A . have good eyesight B . produce blood cells C . get enough calcium D . heal wounds quickly
9. （5） According to the passage above, which of the following is TRUE?

   A . We can get vitamins from everything. B . We can live healthily with few vitamins. C . Vitamins are not important to our health. D . Different vitamins help us in different ways.